What does the atomic number of an element represent? a. the number of electron shells in an atom of the element b. the number of nuclei in an atom of the element c. the number of neutrons in an atom of the element d. the number of protons in an atom of the element

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