A population of fish in a 5 sq mile stretch of river is 500 fish. What is the population density of fish per
square mile in that seciton of river?


100 fish per square mile

105 fish per square mile

110 fish per square mile

95 fish per square mile

Answer:

A) species diversity tends to increase as a result of ecological succession.

Explanation:

The blue arrows denote the direction of the energy transfer from the turbine to the electrical generator. Based on the given diagram, the energy transfer between the blue arrows is a gain in energy.

Energy transfer refers to the conveyance of energy from one form to another, such as mechanical energy into electrical energy. Therefore, there is an increase in energy between the turbine and the electrical generator, which is highlighted in the blue arrows' direction.

The generator gains energy in the form of kinetic energy from the turning motion of the turbine. When the turbine turns the shaft of the generator, it causes electromagnetic fields to occur within the generator, which, in turn, generates electricity.

This energy transfer process is efficient as long as the system does not face friction or other forms of resistances. If the system does face such resistances, then there is a loss of energy and inefficiency in the energy transfer process, which can significantly affect the system's overall performance.

In conclusion, the energy transfer between the blue arrows is a gain in energy. The generator gains energy in the form of kinetic energy, which is converted into electrical energy. The efficient energy transfer process is vital for the system's optimum performance and operation.

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When comparing absorbance readings of the same sample measured by different people using different instruments, it's important to exercise caution. Directly comparing absorbance readings without considering potential variability between instruments and operators can lead to inaccurate or misleading conclusions.

Here are a few factors to consider:

Calibration: Different instruments may have variations in calibration, which can result in different baseline readings or scaling factors.

Instrument Specifications: Different instruments may have variations in their optical characteristics, such as the wavelength range, bandwidth, or detector sensitivity.

Operator technique: The technique and experience of the individuals performing the measurements can influence the results.

Sample Variability: Even when using the same sample, there can be inherent variability in the composition or concentration of the analyte being measured.

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Answer:

Rh+ blood can receive Rh+ and Rh- blood.

Rh- blood can only receive Rh- blood.

Explanation:

EDGE 2020

If a person has Rh+ blood they can receive both Rh+ and Rh- blood. If a person has Rh- blood they can receive only Rh- blood.

The Rh factor may be defined as an important characteristic of blood cells. It indicates whether the blood of two different people is compatible when mixed.

A person with the Rh+ factor will not make anti-Rh antibodies. But a person with the Rh- factor will make the anti-Rh antibodies.

Therefore, if a person has Rh+ blood they can receive both Rh+ and Rh- blood. If a person has Rh- blood they can receive only Rh- blood.

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Answer:

true

Explanation:

In total, there will be 6 tractors and 18 pounds of rice produced.

If both the United States and India spend half of their resources producing tractors and half of their resources producing rice, then the total production of tractors and rice can be calculated as follows:
The United States can produce 8 tractors or 16 pounds of rice, and since they are spending half their resources on tractors and half on rice, they will produce 4 tractors and 8 pounds of rice.
India can produce 4 tractors or 20 pounds of rice, and since they are spending half their resources on tractors and half on rice, they will produce 2 tractors and 10 pounds of rice.
Therefore, in total, there will be 6 tractors and 18 pounds of rice produced.

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Answer:

Explanation:

DNA replication needs to occur because existing cells divide to make new cells, so that the DNA needs to be copied before cell division so that each new cell receives a full set of instructions.

DNA replication - It is the process of producing two identical copies of DNA molecules from one original DNA molecule.

The cell cycle is the series of events that lead to a cell's genome duplication and final division into two daughter cells.

It consist of two main phases - Interphase and M phase

DNA replication occurs at the interphase during S phase of the cell cycle.

Mitosis begins after interphase.

DNA replication occurs before mitosis and cell division so that each newly formed daughter cell receive full set of chromosomes as of parent cell in their nucleus. DNA contains  instructions that helps the newly formed cells to operate properly.

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D. Somatotopic mapping; retinotopic mapping; tonotopic mapping.

Somatotopic mapping refers to the organization of the somatosensory system, where sensory information from different body parts is represented in an ordered manner on the somatosensory cortex. Retinotopic mapping refers to the organization of the visual system, where visual information from different regions of the retina is represented in a spatially organized manner in the visual cortex. Tonotopic mapping refers to the organization of the auditory system, where different frequencies of sound are represented in an orderly manner along the auditory pathway, from the cochlea to the auditory cortex. These concepts highlight the idea of spatial organization and mapping of sensory information in the respective sensory systems. They demonstrate how different areas of the brain are dedicated to processing specific aspects of touch, vision, and hearing, allowing for efficient perception and interpretation of sensory stimuli in each modality. are somatotopic mapping, retinotopic mapping, and tonotopic mapping.

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The most basic need in order for the human body to make proteins is the amino acids.

Proteins are very essential for the human body and its most essential and defining characteristic from a nutritional standpoint is its amino acid composition.

What are amino acids?

These are organic compounds that contain both amino and carboxylic acid functional groups. Although hundreds of amino acids exist in nature, by far the most important are the alpha-amino acids, which comprise proteins.

Amino acids are made by the in two different ways: either from scratch or by modifying others.

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Answer:

rain is very important for life in certain areas, this is why you see little life in deserts and even they need rain occasionally. more rain will lead to more life, first, it will be the plants that move in, then once they grow, vegetation eaters will move in, then after that meat-eaters will move in to eat those creatures and the ecosystem will flourish.

Answer:

the process of turning from liquid into vapour

Answer:

Evaporation is a surface phenomenon, which implies that the process only occurs at the surface of the liquid. During evaporation, the molecules of the liquid that are present at its surface overcome the intermolecular forces of attraction to break away from the liquid and escape into the atmosphere as a gas (or vapour).

Or

The process of turning from liquid into vapour

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Vertebrae have a central opening, called vertebral foramen, that form the spinal canal and contain the spinal cord.

If several highly educated scientists all study the same scientific data, then they may have different conclusions because of the following factors:

Interpretation of data: Each scientist may have a different interpretation of the data, leading to different conclusions. This is because interpreting data involves the use of subjective judgment and prior experiences with similar data.

Personal biases: Personal biases may also affect the conclusions drawn from the scientific data. Personal biases refer to a scientist's preconceived ideas or prejudices that can influence their interpretation of the data. This can affect their ability to draw an objective conclusion.

Overemphasis of certain aspects: The overemphasis of certain aspects of the data or leaving out of certain details can result in different conclusions among scientists. Scientists may focus on different aspects of the data, leading to different conclusions.

Experimental setup and procedure: The experimental setup and procedure can also have an impact on the conclusions drawn from the data. If there are variations in the experimental setup or procedure, it can lead to different conclusions among scientists.

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Answer:

D

Explanation:

The average duration of M phase in these cells is 0.1538 hours or approximately 9.23 minutes per cell.

To calculate the average duration of M phase, we need to know the number of cells in each phase of M phase (prophase, prometaphase, metaphase, anaphase, and telophase) and the total duration of the cell cycle.

Given data:

To calculate the average duration of M phase, we'll follow these steps:

Step 1: Calculate the total number of cells in M phase (M).

M = P + PM + M + A + T

M = 45 + 30 + 27 + 20 + 8

M = 130

Step 2: Calculate the average duration of M phase.

Average duration of M phase = Total duration of the cell cycle / Number of cells in M phase

Average duration of M phase = 20 hours / 130 cells

Average duration of M phase ≈ 0.1538 hours per cell

Therefore, the average duration of M phase in these cells is approximately 0.1538 hours or approximately 9.23 minutes per cell.

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Answer:

AIR MOVES FROM AREA OF HIGH PRESSURE TO AREA OF LOW PRESSURE.

Explanation:

pine trees, redwoods, and conifers belong in gymnosperms plant group.

The gymnosperms are a clade of seed-producing crops that involves conifers, cycads, Ginkgo, and gnetophytes. They form the clade Gymnospermae, and the living members of this clade are known as Acrogymnospermae. The term gymnosperm is derived from the Greek compound word o, which literally means "nked seeds."

Gymnosperms are a small class of plants that do not flower and produce "nked seeds." This implies that the seeds are generated on the reproductive structure's surface rather than within it, as in fruit.

Conifers (pines, cypresses, and relatives) are by far the most numerous group of living gymnosperms, followed by cycads, gnetophytes (Gnetum, Ephedra, and Welwitschia), and Ginkgo biloba (a single living species). Gymnosperms are dioecious in about 65% of cases, but conifers are mostly entirely monoecious.

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Answer:

In addition to oxygen, they require a basic substrate such as sugar. Some yeasts can ferment sugars to alcohol and carbon dioxide in the absence of air ...

In addition to oxygen gas, for the fermentation the basic substrate such as sugar is required. Some yeasts are required that can ferment sugars to alcohol and carbon dioxide in the absence of air.

Fermentation is the process in which a substance is broken down into a simpler substance. Fermentation is the metabolic process through which organic molecules such as carbohydrates, such as starch or a sugar are converted into acids, gases, or different types of alcohols in the absence of oxygen or any other type of electron transport chain.

Yeasts are the organisms which preferentially metabolize sugars that are converted principally to ethanol molecule and carbon dioxide gas, however they can utilize different carbon sources, such as amino acids, organic acids, polyols, alcohols, fatty acids, and other organic compounds, depending on the species which undergo metabolic reaction.

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Based on the information provided, all the requirements for a hypothesis test are satisfied. The sample sizes are large, the random assignment was performed, the observations are independent, and the success-failure condition is met. Therefore, we can proceed with testing the claim that the rate of polio is less for children given the Salk vaccine.

In order to determine if the requirements for a hypothesis test are satisfied, we need to consider several factors. Let's go through them step by step.

1. Random Assignment: In the largest clinical trial ever conducted, 401,974 children were randomly assigned to two groups - the treatment group and the placebo group. This random assignment helps to ensure that the groups are comparable and reduces the potential for bias.

2. Independence: To satisfy the requirements for a hypothesis test, the observations in each group should be independent of each other. In this study, each child is assigned to either the treatment group or the placebo group independently. Therefore, the requirement for independence is satisfied.

3. Large Sample Size: The sample sizes in both the treatment and placebo groups are quite large. The treatment group consisted of 201,229 children, and the placebo group consisted of 200,745 children. These sample sizes are large enough to satisfy the requirements for a hypothesis test.

4. Success-Failure Condition: To use the methods for testing a claim about two population proportions, we need to check the success-failure condition. This condition requires that both the number of successes and failures in each group be at least 10. In the treatment group, 33 children developed polio, which is greater than 10. In the placebo group, 115 children developed polio, which is also greater than 10. Therefore, the success-failure condition is satisfied.

Based on the information provided, all the requirements for a hypothesis test are satisfied. The sample sizes are large, the random assignment was performed, the observations are independent, and the success-failure condition is met. Therefore, we can proceed with testing the claim that the rate of polio is less for children given the Salk vaccine.

It's important to note that hypothesis tests involve additional steps, such as formulating hypotheses, calculating test statistics, and determining the significance level. However, the requirements for a hypothesis test have been met in this case.

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Answer:

For efficient transportation of blood.

Explanation:

Answer:

The answer is b

Answer:

The correct answer is B. Combustion is a chemical change. When a substance is burned, it forms new substances. Therefore, combustibility is a chemical property because it can only be observed when a substance undergoes a chemical change.

Explanation:

Hope that helps!

Answer:

The answer would be "A substance combusts (burns)".

Explanation

All of the other options are basic physical changes that don't alter the substance on a molecular level, whereas burning a substance permanently changes the molecular makeup.

Considering the costs and benefits, it is best to remove arsenic from the water, as the savings in population health and quality of life are greater than the cost of this operation.

Prolonged exposure to arsenic in water and food can cause cancer, skin damage, developmental problems, heart disease, diabetes, and damage to the nervous system.

Currently, the most commonly used process to remove arsenic is to run potable water over the activated alumina (aluminum oxide) surface on which the arsenic is adsorbed. Reverse osmosis can also be used for arsenic removal.

With this information, we can conclude that arsenic It can be absorbed orally and through the airways, its lethal dose is 0.07g/kg, bioaccumulative, practically all arsenic compounds are toxic to the human body. Its acute or chronic exposure and concentration are often monitored by urine tests.

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All living things share seven life processes that are essential for their survival. These include movement, respiration, sensitivity, growth, reproduction, excretion, and nutrition.

All living things share seven life processes that are essential for their survival. These include movement, respiration, sensitivity, growth, reproduction, excretion, and nutrition.
Movement refers to the ability to change position and move from one place to another. This can be seen in animals, plants, and even microscopic organisms such as bacteria.
Respiration is the process of taking in oxygen and releasing carbon dioxide. This is necessary for the production of energy that fuels all life processes.
Sensitivity involves the ability to respond to changes in the environment such as light, sound, and touch. This helps living things to adapt and survive in their surroundings.
Growth refers to the increase in size and complexity of an organism over time. This process is regulated by genetic factors and environmental conditions.
Reproduction is the ability to produce offspring, either sexually or asexually. This ensures the continuation of the species.
Excretion is the elimination of waste products from the body. This is important for maintaining a healthy internal environment.
Finally, nutrition is the process of obtaining and using nutrients for energy and growth. This includes the intake of food, the breakdown of nutrients, and the absorption of essential elements such as water and minerals.
In summary, all living things share these seven life processes, which are crucial for their survival and adaptation to changing environments.

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Answer:

similar results in multiple tests of the claim

Explanation:

A scientific claim comprises of similar results in multiple tests of the claim.

Scientific methods include observation, performing experiments, inference etc.

A scientific claim is however said to be valid when the results of the experiment are reproducible multiple times in any part of the world. The results are usually shared with others to ensure that the several tests are conducted by different scientists to check its authenticity.

The answer is C) Similar results in multiple tests of the claim on Edge 2020