The great body of water that covers more than 70% of ther
earth's surface.
The infant of an organism, the result of sexual reproduction.
An epoch of time lasting from 38 million to 26 million years
ago.
A unit of scientific classification after classes but before
families in terms of biological relationships.
A living being.
Breeding or mating of individuals of different strains of the
same species.
The growth of a population to the point where its environment
can't sustain it.
A chemical reaction in which a substance loses electrons.
Oxidation occurs inside organisms when sugar combines with oxygen
to produce carbon dioxide, water, and energy.
Oxide
A chemical compound of oxygen with some other element.
A life-supporting gas and a chemical element. Nearly all living
things need oxygen to stay alive.