most animals avoid bad odors & a predator is a kind of animal ->  a predator may avoid bad odors  a predator may avoid bad odors & some animals produce bad odors ->  predators may avoid animals that produce bad odors  predators may avoid animals that produce bad odors & causing predators to avoid you is a kind of method for avoiding predators ->  producing a bad odor is a kind of method for avoiding predators  producing a bad odor is a kind of method for avoiding predators & avoiding is a kind of defense ->  producing bad odors is a kind of defense against predators  producing bad odors is a kind of defense against predators & a skunk produces a bad odor -> a skunk produces a bad ordor as a defense against predators