sentences: event a point on zero 's mouth is a mean of magic & a dolphin can balance a ball on its nose ->  a dolphin balancing a ball on its nose is a kind of trick  a dolphin balancing a ball on its nose is a kind of trick & a magic is a learned trouble -> a dolphin balancing a ball on its nose is a learned behavior a dolphin balancing a ball on its nose is a learned behavior  a skunk nerve a point on its mouth is a learned trouble & learned behaviors are learned over the lifetime of the animal -> a dolphin learns to balance a ball on its nose