Why is it highly unlikely the adaptations seen in the killifish could occur in other species of concern?

Elephants in the savanna regions of africa dig holes in dried up river beds to reach water lying just below the surface. these holes provide drinking water for other animals as well. so, without the elephants, many animals might otherwise die from lack of water during the dry season. the location in which the elephants live is an example of a/n and the role they play in creating water holes is an example of a a) ecosystem; habitat b) community; niche c) habitat; niche d) niche; habitat

Can someone i have no idea of how to do this.

Methane gas created by a cows flatulence especially in a large herd is a greenhouse gas. true or false.