Why is there great variation among vario...

Why is there great variation among various regions in doubling their population?

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Developed countries have controlled their growth rate due to expansion of educational facilities and advancement in medical facilities. Developed countries are taking more time to double their population. Developing countries are taking less time to double their population due to lack of educational and medical facilities.

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There is a great variation in the nature of pericarp in

Berries

Dry fruits

Fleshy fruits

Indehiscent dry fruits

Genteic variation in a population arises due to

Recombination only

Mutaions as well as recombination

Reproductive isolation and selection

Mutations only

Genetic variations in a population arise due to

recombination only.

recombination as well as Mutation.

Reproductive isolated & selection .

Mutations only .