Choose all of the following situations below that are examples of pre-zygotic barriers to reproduction. (choose all that apply) a. ecological isolation b. incompatibility of sperm and eggs (sperm cannot fertilize the egg) c. two species of ants are capable of breeding under laboratory conditions, but do not because one species is only found in association with white pines and the other ant species is only associated with willows, thus the two ant species never occur together in nature to breed d. lions and tigers produce hybrid offspring, but all hybrids are sterile e. behavioral isolation f. the embryo dies due to a lethal combination of genes