Answer:
Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.
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Autonomic nervous system innervates the entirety of the gastrointestinal tract
Answer: B, the number of species in a community
Explanation:
