The contraction of the arrector muscles (pilomotor muscle or arrector pili) in humans causes ________.
A. generation of heat to raise the body temperature
B. hairs to stand on end with no apparent function
C. hairs to stand on end, trapping an insulating layer of warm air next to the skin
D. hairs to stand on end to make the individual appear bigger
E. increased ability to feel pain
Answer: B
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Metabolism is homeostatically regulated but, during lactation, metabolism has to be adjusted to account for the energetic demands of milk production. This process is referred to as ___________
Fill in the blank with correct word
What inner ear structure detects acceleration and deceleration movements of the head?
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An aquatic egg and larva are ancestral characters of anurans, but terrestrial eggs and even direct development that bypasses the larval stage entirely have evolved independently in many lineages of anurans
Why didn't all lineages evolve that way? That is, why might it be advantageous for a species of frog to have retained an aquatic egg and a larval stage?