Help will give brainlist

Which of the following is an advantage of solar energy?

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 are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain