Rate of energy gain is a "common currency" that is frequently used as an indicator of beneficial long-term fitness effects. We usually feel comfortable with that because
A) increased food intake has been found to increase survival and fecundity in a number of species.
B) it can be measured over varying units of time.
C) it can usually be measured directly.
D) all of the above

Question

Quizplus · Accepted Answer

The rate of energy gain is a common currency used to indicate beneficial long-term fitness effects because it encompasses several factors: increased food intake has been shown to boost survival and fecundity across various species, it allows for measurements over different time scales, and it is typically something that can be directly measured.

Rate of Energy Gain Is a "Common Currency" That Is