| Term | Definition |
|
Invertebrate |
Animal lacking a backbone |
|
Vertebrate |
Animal with a backbone |
|
Feedback Inhibition |
The product or result of a process stops or limits the process |
|
Blastula |
Hollow ball of cells |
|
Protostome |
Animal whose mouth is formed from the blastopore |
|
Deuterostome |
Animal whose anus is formed from the blastopore |
|
Endoderm |
Innermost germ layer |
|
Mesoderm |
Middle germ layer |
|
Ectoderm |
Outermost germ layer |
|
Radial Symmetry |
Describes animals that are symmetrical such that when divided in any way from the center there are two equal halves |
|
Bilateral Symmetry |
Describes animals who can only be divided into two equal parts one way |
|
Cephalization |
The concentration of sense organs and nerve cells in the front of the body |