In animals, the life - prolonging benefits of energy restriction become evident when the diet provides enough food to prevent malnutrition and an energy intake of about of normal. a. 50% b. 60% c. 70% d. 90% e. 80%

Rarefaction is used for which of the following? a. creating a representative sample b. studying how disease impacts populations c. rediscovering species thought to be instinct d. determining which sea creatures live in an area