#Question id: 5084
#5. Developmental Biology
The first cavity formed during frog development is the ________.
#Question id: 5085
#5. Developmental Biology
An embryo with meroblastic cleavage, extraembryonic membranes, and a primitive streak must be that of ________.
#Question id: 5086
#5. Developmental Biology
Cells move to new positions as an embryo establishes its three germ tissue layers during ________.
#Question id: 5087
#5. Developmental Biology
The outer-to-inner sequence of tissue layers in a post-gastrulation vertebrate embryo is ________.
#Question id: 5088
#5. Developmental Biology
If gastrulation was blocked by an environmental toxin, then ________.
#Question id: 5089
#5. Developmental Biology
The archenteron of the developing sea urchin eventually develops into the ________.