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Explain the phases of life span in organ...

 Explain the phases of life span in organisms.

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(a) Juvenile or Vegetative Phase: The period from birth to reproductive maturity in animal (or) germination to flowering in plants respectively.
(b) Reproductive Phase: The phase at which an organism attain reproductive maturity and start producing gametes.
(c) Senescent Phase: The last phase of ageing that ultimately results in death of an organism.
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