Answer:
Nonhuman life in an urban ecosystem differs from that in an undeveloped forest ecosystem
Explanation:
Answer:
Blood, the heart pumps oxygen-poor blood to the lungs to be oxygenated.
Explanation:
:) Merry Christmas!
Answer:
its motion is the correct answer
Explanation:
External Respiration takes place in the Trachea. When oxygen and co2 "switch" its where they connect and making this external respiration!
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