The Earliest Developmental Stage Among These Choices Is

Question

The earliest developmental stage among these choices is
A)germ layers.
B)morula.
C)blastopore.
D)gastrulation.
E)invagination.

Accepted Answer

The earliest developmental stage is the formation of the morula, which is a cluster of cells formed from the zygote undergoing multiple rounds of cell division. This occurs before the formation of germ layers, blastopore, gastrulation, and invagination.