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Question: which graph supports the hypothesis that the chicken embryos are...

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Which graph supports the hypothesis that the chicken embryos are endothermic heterotherms?

If we had been able to measure the metabolic rate and body temperature of the chicken embryos across a broad range of temperatures, we would have seen that they are really endothermic heterotherms, and that they can regulate their body temperature only in a narrow range of temperatures. (They become endothermic homeotherms soon after hatching). Possible patterns of VO2 and body temperature versus environmental temperature are shown below. Which graph supports the hypothesis that the chicken embryos are endothermic heterotherms? Explain your reasoning.

Environ. Temp. (C) Environ. Temp. (C)

Environ. Temp. (C) Environ. Temp. (C)

Environ. Temp. (C) egg metabolism graph C.png Environ. Temp. (C)

Environ. Temp. (C) Environ. Temp. (C)

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