Which of the following does not occur at a convergent boundary? a. the leading edges of both plates are bent downward. b. oceanic crust is pushed down into the mantle. c. one continental plate moves into an oceanic plate.

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

How many major plates cover the earth

The response is the basis for vaccination. primary secondary tertiary none of the above