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birds without a keel on their breastbones and therefore unable to fly, for example ostriches.
(also called vascular tissue) the tissues that transport water and dissolved food in a...
secretory tissue in the leaves of plants that secretes water through pores in the epidermis or...
external opening of the rectum (part of the mammalian digestive tract) through which faeces are...
the spread of cancer cells from the original (primary) malignant tumour to other parts of the...