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One of the three basic states of matter (solid and liquid). Gas consists of particles that have neither a defined volume nor defined shape.

The parts of the brain and spinal cord made up primarily of groups of neuron cell bodies (as opposed to white matter, which is composed mainly of myelinated nerve fibers).

A group is the combination of a set and binary operation.

The increases in cell size and number that take place during life.

The force by which a planet or other body draws objects toward its center. The force of gravity keeps all of the planets in orbit around the sun.

Also called gamma radiation. A form of electromagnetic radiation arising from the radioactive decay of atomic nuclei.

A geometric term that indicates a side to side direction.

The increases in cell size and number that take place during life.

One of the three basic states of matter (solid and liquid). Gas consists of particles that have neither a defined volume nor defined shape.

The southern point of Earth's axis of rotation (in Antarctica).