Define evolution and determine the mechanism behind it

Energy derived from hot rocks and fluids beneath the earth’s surface is

In which situations is the principle of cross-cutting relationship useful in determining relative age?

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