Question

at what stage does the umbilical cord develop?
o during the first trimester
o during the second trimester
o during ovulation
o during fertilization

Explanation:

The umbilical cord begins to develop during the first trimester of pregnancy. It forms from the connecting stalk and yolk sac and plays a crucial role in nutrient and waste - exchange between the mother and the fetus. Ovulation and fertilization are early events in reproduction that occur before the development of the umbilical cord. The second trimester is after the cord has already developed.

Answer:

A. during the first trimester