When the environment acts for or against one extreme characteristic, this is an example of which category of natural selection?

Directional selection

Explanation:

occurs when natural selection favors one extreme of continuous variation. Over time, the favored extreme will become more common and the other extreme will be less common or lost.

i think it's they require warm air

explanation:

tornados usually happen when it's raining right so when it's raining it cools down so if the temperature keeps changing then i think a tornado occurs sorry if it's wrong

the sphincter muscles at the end of the digestive tract is the anus.