Choose the correct pairing of human developmental event and trimester.
A) Liver stores glycogen: second trimester
B) Placenta forms: second trimester
C) Fingernails grow: first trimester
D) Lungs first breathe air: first trimester
E) Heart begins to beat: first trimester

Question

Quizplus · Accepted Answer

The heart begins to beat during the first trimester, around week 6 of development.

Answer: B
 The placenta forms during the second trimester, around week 12 of development.

Therefore, the correct pairing is E-B, and the answer is "E, B."

Choose the Correct Pairing of Human Developmental Event and Trimester