What is the difference between Asteroids, Meteoroids, and Comets?

a small rocky body orbiting the sun. Large numbers of these, ranging enormously in size, are found between the orbits of Mars and Jupiter, though some have more eccentric orbits.

a small body moving in the solar system that would become a meteor if it entered the earth's atmosphere.

A comet is an icy, small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process called outgassing. This produces a visible atmosphere or coma, and sometimes also a tail.

the correct answer is:

a population changes in response to a change in the environment.