The Relative Lengths of the Frog and Mouse Branches in the Phylogenetic

question 4

Multiple Choice

The relative lengths of the frog and mouse branches in the phylogenetic tree in Figure 26.13 indicate that

• A) frogs evolved before mice.
• B) mice evolved before frogs.
• C) the homolog has evolved more rapidly in mice.
• D) the homolog has evolved more slowly in mice.

---

Definitions:

Unconditioned Response

A natural, automatic reaction to a stimulus that occurs without prior learning or conditioning.

Conditioned Response

A learned reaction to a previously neutral stimulus, established through classical conditioning.

Learned Response

A reaction or behavior that an individual acquires through conditioning or experience in response to a specific stimulus.

Neutral Stimulus

A stimulus that initially produces no specific response other than focusing attention, until it is associated with an unconditioned stimulus in classical conditioning.