Why do some animals live much shorter lifespans than humans and others much longer? What determines the lifespan on an animal?
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The lifespan of an animal is determined by many things, including how big the animal is, what kind of food it eats, how often it has babies, and whether it lives in a dangerous environment. Smaller animals usually live shorter lives than bigger animals because they have a higher metabolism and burn up their energy faster. Animals that eat lots of fresh food tend to live longer than animals that eat lots of processed food. Animals that have lots of babies tend to have shorter lifespans than animals that have fewer babies. And animals that live in dangerous environments tend to have shorter lifespans than animals that live in safer environments.
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