Question

Which happens during the second trimester?
O A. The vocal cords develop.
O B. The heart starts working.
C. Rhythmic breathing starts.
D. Blood begins to form.

Answer 1

Answer:

A

Explanation:

Answer 2

The heart starts working. Thus the correct option is B.

What happen during first trimester?

From the time of conception,  baby will grow and change inside uterus until he or she is born. Each trimester has a unique set of milestones. In the first trimester, your baby will grow from a fertilized egg into a moving fetus with eyes, ears, and working organs.

In the second trimester, baby’s features develop and expecting mother may be able to feel baby move. In the third trimester, baby will grow rapidly to get ready for birth.

For more information regarding  trimester, visit:

https://brainly.com/question/2119944

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