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a special effect that presents the action at a faster than normal pace. Speeded-up motion is...
patterns useful to learn for spelling correctly, as certain words are spelt in similar ways, and...
a set of points in space equally distant from a given (central) point.
a ring of muscle that controls the passage of substances through a tube or body opening.
a small, circular opening in the exoskeleton of insects that allows air to enter the insect's...
the instrument that measures the volume of air entering and leaving the lungs.
a special effect that shows action in two different places at the same time. Often used with a...
Spontaneous emission occurs when excited atoms lose their energy through random de-excitation...
(also called voluntary population movement) the voluntary movement of people from one place to...