Why are components that are naturally found in air be considered air pollutants?

It is because components of air like carbon dioxide can be considered as a pollutant when the concentration of these gases is larger than the normal range due to human activity like the burning of fossil fuel. At a higher concentration, even the naturally occurring gases may have an undesirable effect on the environment. The high level of carbon dioxide can cause an increase in the earth's temperature.

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.

c is the answer to this question. altitude affects the weather because air molecules evaporate.