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T

taxodont

Having many, small, similarly-shaped hinge teeth.

taxon

An organism or group of organisms of the same rank, e.g., members of an order, family, genus, or species. (pl. taxa)

theory

A hypothesis that has become “widely accepted” after rigorous testing; see also hypothesis, law.

transformation

The theory suggesting that traits of an organism are produced and inherited by direct influence of the physical environment, by effort, or by use or disuse of body parts.

Tree of Life

A depiction of the relationships of life on Earth in an evolutionary context. The Tree of Life is often depicted as a detailed cladogram, and illustrates the idea that all life on Earth is related.