Organisms that breaks down dead plants and animals into simplier compounds

Which property is used to identify the origin of an igneous rock? color density hardness crystal size

Suppose you are estimating the size of a blue crab population. what is the population size if the number marked in the first catch is 40, the total number in the second catch is 200, and the number marked in the second catch is 50?

How had the study of mitosis affected scientists knowledge of cancer