Life Cycles

Tiffany Alcorn

What is a life cycle?

A life cycle is the series of changes in the life of an organism, including reproduction.

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Animal Life Cycles

Most animals including fish, mammals, reptiles and birds have very simple life cycles:

  • they are born (either alive from their mother or hatched from eggs)
  • they grow up

These animals have three stages -- before birth, young and adult. The young are typically similar to the parent, just smaller. The young slowly "grow" to become adults.

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What is metamorphosis?

Metamorphosis is a process some animals go through to become adults. It is a series of physical changes. Metamorphosis is especially common in insects. Genes and chemicals called hormones control the process.

Complete Metamorphosis

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Incomplete Metamorphosis

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