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the movement of an organism in response to a one-directional source of light when the stimulus does not determine the direction of the movement.
part of the skeleton that occurs in the head which supports the structures of the face and forms...
a large domain of prokaryotic micro-organisms. They are typically a few micrometres in length...
movement of the Earth's continents as the Earth's tectonic plates shift.
(also called an extinction event) the sudden dying out of large number of species over a short...