Why does a cell need to copy its DNA before undergoing mitosis?

Which incident would result in primary succession instead of secondary succession?

Barbara is converting 78°f to degrees celsius. first, she subtracts 32 from 78. what is the next step?

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