The exchange of gases between an organism and its environment is known as:
a. exhalation.
b. aeration.
c. inhalation.
d. respiration.
e. ventilation
D
Biology & Microbiology
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Birds are thought to have evolved from
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The sturdy, two-layer membrane that covers bones is called the
a. pericardium. b. perimycium. c. periosteum. d. pericomium. e. pericilium.
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What will be an ideal response?
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The central nervous system contains:a
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