Which 2 substances are reactants in chemical reactions of cellular respiration

What do scientists need to look at before developing an argument

If the frequency of the p allele is .63 in the population then what is the frequency of the q allele?

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