What keeps mammals warm?\nOptions:\n- (A) evaporation\n- (B) Animal fur\n- (C) staying warm\n- (D) sweating\n- (E) They have thick fur\n- (F) with their fur\n- (G) a layer of fat\n- (H) Veins and arteries.
Let’s work this out in a step by step way to be sure we have the right answer.
(G)
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.

.

The answer: (G)