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ruslelena [56]
3 years ago
9

You can put A. B. C. or D.thank you :)​

Biology
1 answer:
fredd [130]3 years ago
3 0

Answer: A

Explanation:

Our universe was born from the Big Bang about 13.5 billion years ago. ... Our solar system began forming about 4.6 billion years ago within a concentration of interstellar dust and hydrogen gas called a molecular cloud. The cloud contracted under its own gravity and our proto-Sun formed in the hot dense center.

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Is necessary for the absorption of vitamin B12 in the small intestine. Chief cells, Located primarily in the basal areas of gastric glands are chief cells, which secrete pepsinogen, the inactive proenzyme form of pepsin.

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To learn more about pepsin click here:

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