Nymph is the young of Dragonfly, grasshopper, louse A calf is a baby cow.A baby dolphin is called a calf.Most baby birds are called chicks.A baby llama is called a cria.A cygnet is a baby swan.A...
Animal life began when the oxygen content of the atmosphere reached a level where it could be employed in respiration. (The definition of animal.) This occurred sometime late in the Pre-Cambrian just...