What is an index fossil A.) is a list of all fossils found in a particular layer of rock.

B.) is a fossil that is found in many locations over a large area, and is from a species that did not exist fora long period of time.

C.) is a particular fossil of an organism that is related to all other organisms.

D.) None of the above.

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism

Below, the levels of organization in a multicellular organism are shown from least to most complex. which level of organization can be described as several different types of tissues working together to perform a common task?

How does science influence the decisions made about social, economic, and political issues?