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N 2 content is kept constant in the biosphere due to

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The bacteria able to change shape and size with changes in the environmental conditions are known as In castor and several other related plants a fleshy whitish tissue is formed at one end of the seed. This is called the Which combination of chromosome in mankind give birth to a male child? The tendency among animals to concentrate in numbers larger than found in normal distribution, and which congregate under various circumstances mostly by their own movements is known as Which of the following viruses has capsid covered by envelope?