The liquid portion of blood.

Began to break apart 200 million years ago and form the present landmasses

Is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation

A projectile always travels in a

Smallest particle

The culmination of pregnancy, during which a baby grows inside a woman's uterus.

These are cellular secretions which help regulate the breakdown and buildup of various substances in the body.

The moon’s gravitational pull causes

Are organisms whose cells lack a nucleus and other organelles.

A mode of reproduction in which a new offspring is produced by a single parent.