sentences: balancing a ball on one 's nose is a kind of trick & 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 trick is a learned behavior ->  a dolphin balancing a ball on its nose is a learned behavior  a dolphin balancing a ball on its nose is a learned behavior & learned behaviors are learned over the lifetime of the animal -> a dolphin learns to balance a ball on its nose