question: A high metabolic rate and hair are ways mammals generate and conserve what?
distractor3: water
distractor1: resources
distractor2: energy
correct_answer: heat
support: Mammals have several ways of generating and conserving heat, such as a high metabolic rate and hair to trap heat. They also have several ways to stay cool, including sweating or panting. Mammals may be herbivores, carnivores, or omnivores. They have four types of teeth, so they can eat a wide range of foods. Traits of the heart and lungs keep the cells of mammals well supplied with oxygen and nutrients.