The answer is comet.
Comets are mainly ice. They orbit around the sun with a periods that varie from few years to tens of millions of years.
An asteroid is composed of rocks, metals or both.
Meteorites are meteors that get the earth and are composed of rocks and metals or both.
Meteors:
Carrying capacity is the theoretical maximum rate of population growth. It is the maximum population size that the environment can sustain. This means that it is the maximum number of individuals of given species that the evironment's resources can sustain. It is the population size that can have enough water, food, habitat and other resources in order to survive and live.
Answer:
c
Explanation:
smog is smog because of the air pollution