The disproportionately high appearance of polydactylism among the amish suggests that a. it is a common mutation b. it is a common birth defect in pennsylvania c. it was overrepresented in the gene pool of the original amish settlers d. humans are prone to this birth defect select the best answer from the choices provided a b c d

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