Mammals have a layer of fat under the skin to help insulate the body.
Glass insulation keeps beverage warm for hours.
Mammals have a layer of fat under the skin to keep them warm.
What keeps mammals warm?
Options:
1: evaporation
2: Animal fur
3: staying warm
4: sweating
5: They have thick fur
6: with their fur
7: a layer of fat
8: Veins and arteries.