galaxy
a large region of space
gas
something that is not a liquid or a solid.
gene
basic unit of heredity
genetic variation
variation in the DNA
genotype
the gentic makeup of a cell
gravitation
the force of attraction between any two masses
gravitational force
the force of attracton between all masses
gravity
the force of attraction that the planets seem to follow towards the center of the earth
habitat
the place where a person or thing is usually found
half-life
the time it requires one half the atoms of a given amount of a radiactive substace to disintegrate
heat
the condition or qualitiy of being hot.
heat transfer
the tranfer of heat from one body or substance to another.