Which structure is most often protected by a lipid bilayer

According to the loco mass the mass of reactants and products

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

With the word calcite wich completes the analogy mineral, erosion, marble, or aragonite