Question

what is a placenta?
a. a ball of about 100 cells
b. a sperm fused with an egg
c. an unfertilized egg
d. a structure that nourishes the fetus

Explanation:

The placenta is an organ that develops during pregnancy. It attaches to the wall of the uterus and is connected to the fetus via the umbilical cord. Its main function is to provide nutrients and oxygen to the growing fetus and remove waste products from the fetus's blood.

• Option A describes a blastocyst (a ball of about 100 cells).
• Option B describes a zygote (a sperm fused with an egg).
• Option C is just an unfertilized egg.

Only option D correctly defines the placenta as a structure that nourishes the fetus.

Answer:

D. A structure that nourishes the fetus