Question

NEED HELP ASAP

Immediately after the cells differentiate—become particular kinds of cells—they begin to form tissues. When does heart tissue first form in a human?

A. during the third trimester of pregnancy
B. during birth
C. during the second trimester of pregnancy
D. during the first trimester of pregnancy

Answer 1

D. During the First Trimester of Pregnancy

Answer 2

Answer:

D. During the first trimester of pregnancy.

Explanation:

The fetus begins to develop a brain and spinal cord, and the organs begin to form. The baby's heart will also begin to beat during the first trimester. Arms and legs begin to bud in the first few weeks, and by the end of eight weeks, fingers and toes start to form. { I also got this right on study island }