In the Section "Investigating Life: Sniffing Out the Origin of Feathers",birds

question 18

Multiple Choice

In the section "Investigating Life: Sniffing Out the Origin of Feathers",birds are most closely related to reptiles,leading the scientists to conclude which of the following?

• A)Endothermy arose once before the split of mammals and reptiles.
• B)Endothermy arose once and was then lost in reptiles.
• C)Birds are actually more closely related to mammals than reptiles.
• D)Endothermy is not a good way to measure the relationship between species.
• E)Endothermy arose twice after the split of mammals and reptiles.

Analyze the impact of environment on brain development and function using rat models.

Describe the hypothalamus and its roles in the nervous system.

Explain the key structures of the midbrain and their functions.

Differentiate between structural plasticity and functional plasticity with examples.

---

Definitions:

Returns To Scale

The change in output resulting from a proportional change in all inputs in the production process; can be increasing, constant, or decreasing.

Increasing Returns To Scale

See Economies of scale.

Economies Of Scale

Exist when average costs fall as output increases.

Diseconomies Of Scale

Exist when average costs rise with output.