Ques:Q: What do you call a group of organisms of the same species that live in the same area? Read this paragraph and choose the correct option from the provided answers: Communities are made up of populations of different species. In biology, a population is a group of organisms of the same species that live in the same area. The population is the unit of natural selection and evolution. How large a population is and how fast it is growing are often used as measures of its health. Choices: - system - ecosystem - biosphere - population A:

Ans:population
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Ques:Q: They had demonstrated that particles smaller than bacteria cause what? Read this paragraph and choose the correct option from the provided answers: Viruses are so small that they can be seen only with an electron microscope. Before electron microscopes were invented, scientists knew viruses must exist. How did they know? They had demonstrated that particles smaller than bacteria cause disease. Choices: - blood - flight - damage - disease A:

Ans:disease
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Ques:Q: An environment in which cells neither sink nor swell is known as what? Read this paragraph and choose the correct option from the provided answers: Figure 41.2 Cells placed in a hypertonic environment tend to shrink due to loss of water. In a hypotonic environment, cells tend to swell due to intake of water. The blood maintains an isotonic environment so that cells neither shrink nor swell. (credit: Mariana Ruiz Villareal). Choices: - pressured environment - electrolyte environment - exothermic environment - isotonic environment A:

Ans:isotonic environment
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Ques:Q: What device is used to stop a current in a circuit? Read this paragraph and choose the correct option from the provided answers: Understand current as it passes through a series circuit. Choices: - a signal - a valve - a mirror - a switch A:

Ans:
a switch
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