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Why the small birds like humming birds a...

Why the small birds like humming birds are not · found in Polar Regions?

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Thermoregulation is energetically expensive for many organisms and this is particularly true for small animals like shrews and humming birds.
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OSWAAL PUBLICATION-ORGANISMS AND POPUIATIONS-TOPIC :1 Short Answer Type Questions-I
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  9. Write a note on suspend.

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  14. Small animals are rarely found in Polar regions .Why?

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  15. An organism has to overcome stressful condition for a limited period o...

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  16. Why the small birds like humming birds are not · found in Polar Region...

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