In linnaeus's system of classifying organisms, orders are grouped together into: a. classes. b. families. c. genera. d. species.

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?

In which case would a scientist choose to use a dissecting microscope rather than a compound microscope

Modern sea star larvae resemble some primitive vertebrate larvae. this similarity may suggest that primitive vertebrates