- In the healthy individual, the walls of the intestine are covered by intestinal villi and their microvilli, which contribute to increase the absorption surface of the nutrients we ingest and lead them to the bloodstream so that they reach the organs according to their needs.
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<h2>BRAINLYMENTALMENTE</h2>
"<span>The </span>air sacs<span> permit a unidirectional flow of </span>air through the lungs," -<span>http://people.eku.edu/ritchisong/birdrespiration.html</span>
B.metaphase II i believe to be the answer