A change in one partner in a close relationship that leads to a change in the other partner is

A. symbiosis.
B. mutualism.
C. coevolution.
D. synergism.
E. antibiosis.


Answer: C

Biology & Microbiology

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Which of the following statements is (are) true?

a. All action potentials transmitted by the same neuron are alike. b. The brain assesses a stimulus in part by which neuron pathways are active. c. Different neurons convey different information by transmitting impulses to different areas of the brain. d. A strong stimulus recruits more receptors than does a weak stimulus. e. All of these are true.

Biology & Microbiology

How did Briggs and King move the nuclei between cells?

A. With a dissecting needle B. With a glass pipet C. With a scalpel D. With forceps

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Which is an example of a clumped distribution of a population?

A. A tree species releases a poison to defend the soil around its roots, resulting in trees spaced evenly like a grid. B. Multiple species join each other at the waterhole to drink. C. Antelope travel in herds. D. Two male hummingbirds have a confrontation on the border between their territories.

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The concentration of oxygen is lower at high altitudes. Why would this make it harder for a person to get enough oxygen into their blood?

A. Hemoglobin cannot bind oxygen well at low concentrations. B. The concentration gradient from the alveoli to the blood decreases. C. People are working harder at high altitudes and have higher demands for oxygen. D. The concentration of oxygen in the blood is too low for diffusion into tissues. E. The heart cannot obtain enough energy to pump oxygen into the blood from the alveoli.

Biology & Microbiology