Biology

What fluid-filled sac surrounds the human embryo?

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What can be made from the particles of a dead virus to prevent the disease caused by that virus?
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What is the outermost covering of trees and some plants called?
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What caused the Irish potato famine of the 1840's?
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Which pair of animal species and type is correct?
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What substance is produced by flowers and sometimes causes hay fever?
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What is the period of growth before birth called?
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Which part of a moss absorbs water and nutrients from the soil?
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What is the normal response of a rabbit when spotting a fox?
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