Q.

Thermoregulation is energetically expensive for humming birds, as

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a

they have larger volume relative to surface area

b

they are ectotherms and are dependent on ambient temperature

c

they have very large body size

d

they have larger surface area relative to volume

answer is D.

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Detailed Solution

Humming birds are small-sized with larger surface area relative to volume. Heat loss or heat gain is a function of surface area.

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