Which of the following can bring about the greatest increase in the rate of transpiration?

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In the living cells, insufficient oxygen may cause a breakdown of glucose into

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The crown of the mammalian tooth is covered with

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The element common to protein carbohydrate and lipid is

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One of the accessory organs of the digestive system is the

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Which of the following is formed immediately after the first product of photosynthesis?

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A wide pith with a ring of conducting tissue is characteristic of the root of

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The respiratory organ in the land snail is the

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The gill rakers of fishes take part in

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The respiratory organ in the land snail is the

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The function of maxillipeds in crayfish is to aid

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In the earthworm, the cocoon is secreted by the

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