the quantity of energy a mother or father uses in caring for their young. Since ova are much bigger than sperm, and female mammals go through gestation and then lactation, it is frequently presumed that female mammals have more than males.
the quantity of energy a mother or father uses in caring for their young. Since ova are much bigger than sperm, and female mammals go through gestation and then lactation, it is frequently presumed that female mammals have more than males.