What does the principle of faunal succession state?

a) rock layers with the same unique grouping of fossils are of the same geologic age.
b) fossils are deposited in approximately horizontal layers and spread out until they reach a barrier.
c) specific groups of organisms have followed one another in a definite sequence trough the earth's history.
d) absolute dating is required to determine the relative age of animals based on their fossils.

Migration is a. the movement of organisms from a native location to a foreign location b. the movement of organisms from a foreign location to a native location the movement of organisms from their water supply to their food supply d. the seasonal movement of organisms between locations c. select the best answer from above

Punnett squares are used to show possible combinations of alleles or to predict the probability of a trait occurring in offspring. an incomplete dominance cross is performed between a bird that is homozygous for red feathers and a bird that is homozygous for blue feathers. purple offspring result. then, two of the purple offspring are crossed. according to the punnett square for this cross, how many of the offspring from the second cross will have a feather color that results from incomplete dominance? 1 in 4 2 in 4 3 in 4 4 in 4

What kinds of molecules can pass through the cell membrane without any problem?