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an informal term for any living species which appears to be the same as a species otherwise only known from fossils and which has no close living relatives. These species have all survived major extinction events. The coelacanth is an example of a living fossil.
a group or category in the biological classification system (the plural of taxon is taxa).
the breaking down of large, complex food particles into smaller, soluble molecules which can be...
secretory tissue in the leaves of plants that secretes water through pores in the epidermis or...
a hormone produced by the pituitary gland, which helps to limit the amount of water lost from...