Help Plz 20pts. i just need this one question

Twind is considered to be an abiotic factor because it.?

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

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry