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a level an organism occupies in the food chain.
a hard granule of crystallised minerals which forms in the kidney.
the transfer of pollen from the anther to the stigma of the same plant (self-pollination) or of...
non-indigenous species which reproduce and spread more rapidly than indigenous species. This...
the spread of cancer cells from the original (primary) malignant tumour to other parts of the...
the digestive tract of an animal, made up of different organs, that extends from the mouth to...