Q: Mammals can also generate little bursts of heat through what?\nOptions:\n- (A) Movement of an air mass\n- (B) crackling\n- (C) Veins and arteries.\n- (D) electromagnetic energy\n- (E) house\n- (F) fire\n- (G) muscle contractions\n- (H) aerobic capacity
Let's think step by step below.

User
Mammals can also generate little bursts of heat by shivering. Shivering causes muscle contractions to warm the body. Mammals can also generate little bursts of heat through muscle contractions.
Thus, the answer is (G).
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