Independent of whether an organism is an endotherm or ectoderm, the least reliable indicator of an animal's metabolic rate is the amount of water consumed in one day.
The amount of energy used by a given organism over a specific time period, typically a day, is referred to as metabolic rate. Basal metabolic rate refers to the rate of metabolism when at rest, i.e., when not actively moving (BMR). Compared to when the body is engaged in activities like exercise, the BMR is lower when the body is at rest.
In endotherms, smaller animals typically have higher basal metabolic rates per gram (a "hotter" metabolism) than larger species.
Age, gender, the ratio of your muscle to fat, the amount of physical activity you engage in, and hormone function all have an impact on your metabolic rate.
Endothermic creatures, particularly birds and mammals, have a diminishing growth curve for their metabolic rate.
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