Match Each Term to Its Definition

Multiple Choice

Match each term to its definition.
-blastopore

A) fluid-filled cavity within the blastomere
B) stage in which an embryo has three tissue layers
C) solid ball of blastomeres
D) opening that eventually becomes the anus
E) process that involves an increase in number of cells, but not an increase in mass
F) early stage in formation of the nervous system
G) second stage of cleavage; a formed hollow cavity