Question

most nondisjunction embryos fail to survive.
a true
b false

Explanation:

Nondisjunction is the failure of chromosomes to separate properly during cell division. This can lead to an abnormal number of chromosomes in the resulting cells. Embryos with such chromosomal abnormalities often face developmental issues. Most of them do not survive due to the severe disruptions in normal genetic functioning caused by the incorrect chromosome count.

Answer:

A. True