Which animals are living in a social hierarchy? Check all that apply.
A.a Bengal tiger that lives and hunts alone in the forest.
B.an ant colony in which some gather food and some protect the nest.
C.an adult meerkat that watches for predators while young meerkats play.
D.male mountain goats that compete for the chance to mate with a female
G.a group of mole rats in which some dig tunnels and others care for babies