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The period from birth to the natural death of an organism represents its lifespan. Every organism has a specific average lifespan. It means every organism grows and lives for a particular length of time. Lifespan varies based on the organism.
Lifespan depends upon four stages:
(i) Juvenility: Represents the stage when organism develops the capacity to reproduce.
(ii) Maturity: Stage when reproduction starts.
(iii) Aging and senescence: Progressive deterioration in body of a living being is called aging. The irreversible stage of ageing is known as senescence.
(iv) Death: In death, there is permanent cessation of all vital activities.
Life-Span of some Organisms:
1) Elephant = 60-90years
2) Human = 75-85years
3) Dog = 20-50years
4) Butterfly = 1-2weeks
5) Crow = 15years
6) Banana tree = 25years
7) Cow = 20-25years
8) Parrot = 140years
9) Crocodile = 60years
10) Horse = 60years
11) Fruit fly = 30days
12) Rice plant = 3-4months
13) Tortoise = 100-150years
14) Banyan tree = 200years.
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Why is reproduction essential for organisms?
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