Intro and architecture

Question 1

What is the cambrian explosion

Answer 1

A period of rapid evolution

Question 2

Pseudocoelomate animals differ from eucoelomates because they lack

Answer 2

A body cavity formed from either the schizocoely or enterocoely of mesoderm

Question 3

In the cladogram (nested hierarchy of clades presented as a branching diagram), the derived character “four legs” is a synapomorphy for:

Answer 3

Lizard, Horse, and Monkey

Question 4

Which of the following is an example of homology?

Answer 4

The forelimb of bats and birds.

Question 5

More complex grades of metazoan organization allowed for larger body sizes that included the following advantage(s):

Answer 5

• Decreased energetic cost of temperature regulation per unit body mass in endothermic homotherms.
• Makes moving a gram of body mass over a given distance less than for smaller animals. i.e. More efficient cost of transport.
• Buffering against environmental fluctuations in factors such as temperature.
• Provides protection against predators and promotes offensive tactics

Question 6

Animals with bilateral symmetry

Answer 6

Are better adapted for directed forward movement than radially symmetrical organisms