Topic 20: Origin of Animals Flashcards
1
Q
What’s the sister group to animals?
A
Choanoflagellates (protist with flagella and microvlli)
2
Q
Ediacaran Biota
A
Diverse, soft-bodied, sessile marine organisms that disappeared by the Cambrian.
3
Q
Cambrian Explosion
A
Rapid increase in the diversity of bilateral animals.
4
Q
What are the hypotheses for the Cambrian Explosion
A
Evolution of Predators, O2 Event, Evolution of Hox gene.
5
Q
Clade Metazoa
A
Multicellular, cell differentiation, adhesion, sperm, ova.
6
Q
Clade Eumetazoa
A
True tissues, diploblastic, gastrulation, radial symmetry.
7
Q
Clade Bilateria
A
Bilateral, triploblastic, complex organs.
8
Q
Invertebrates
A
Animals w/o a backbone.
