http://a-z-animals.com/reference/life-cycles/
What Are Life Cycles?
The life-cycle of an animal, includes all of the stages from the end of the last generation to the beginning of the next. Life-cycles vary in time depending on the species of animal, and can be as short as just a few weeks for insects, to up to 200 years for sea urchins. Despite the time differences, all animal cycles begin with the growth and development process, which is then followed by reproduction. The reproduction stage in the cycle of life marks the end of the cycle and many animals often die after they have reproduced just once.
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