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minute pores in the epidermis of a leaf or stem which allows for movement of gases and water vapour.
unicellular fungi, most of which reproduce asexually by a process called budding.
a social structure in which different classes are determined by heredity.
birds without a keel on their breastbones and therefore unable to fly, for example ostriches....
the windpipe or tube that carries air. It is kept open by C-shaped rings of cartilage.