Question

1. how do mammals conserve their heat?

○ with their hair
○ through their placenta
○ by their lungs
○ through their vertebra

Explanation:

Hair (or fur) in mammals creates an insulating layer that traps body heat, reducing heat loss to the environment. The placenta is involved in fetal nutrient exchange, lungs handle gas exchange, and vertebra are structural bones, none of which play a role in heat conservation.

Answer:

A. with their hair