Tristan da cunha is a remote island in the atlantic ocean. in 1814, 15 people formed a colony there, one of whom carried a rare gene for blindness. the frequency of this gene is now 10 times higher on the island than on the mainland from which the settlers arrived. the mechanism of evolution .

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

Restriction enzymes are used in making recombinant dna. describe the role restriction enzymes perform when constructing recombinant dna.

Where can a dna be found in a prokaryotic cell