D oxygen there was no free oxygen on the earth
Answer:
The function of the pleura is to allow optimal expansion and contraction of the lungs during breathing. The pleural fluid acts as a lubricant, allowing the parietal and visceral pleura to glide over each other friction free. This fluid is produced by the pleural layers themselves.
Efferent nerve any nerve that carries impulses from the central nervous system toward the periphery, such as a motor nerve
Answer:
3
Explanation:
From DNA we are able to get RNA (m and t) to make proteins
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