1. How do the metabolic rates of ectotherms compare with those of endotherms of similar mass? 2. How do the metabolic rates of both ectotherms and endotherms vary with mass?
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1. How do the metabolic rates of ectotherms compare with those of endotherms of similar mass?

At a given mass, resting metabolic rates of endotherms are higher than those of ectotherms.

2. How do the metabolic rates of both ectotherms and endotherms vary with    mass?

For both ectotherms and endotherms, animals with larger mass tend to have higher resting metabolic rates.