Anyone know the answer if so just use a, b,c or d

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

Advances in technology have enabled scientists and researchers to better study the evolutionary relationships between species

In what part of the body does the most muscle activity happen?