Chapter 2: Invertebrate Classification and Relationships Flashcards
1
Q
Sudden appearance at ~525-540 mya and apparently rapid diversification of complex animals over several millions of years
A
Cambrian explosion
2
Q
What are the classifications by cell number?
A
- multicellular
- unicellular
- acellular
3
Q
Thee concentration of nervous and sensory tissues and organs at one end of an animal, resulting in distinct anterior and posterior ends.
A
Cephalization
