ecosystem # 生態系 biosphere # 生物圏 biodiversity # 生物多様性 natural environment # 自然環境 life cycle - animals a panda an elephant a rat a dog a rabbit a cat a tiger a lion a bird a bear an octopus a kangaroo a giraffe a horse a monkey a sheep a parrot an antelope a hippopotamus a zebra a deer a mouse a squirrel a goat a hamster a chinchilla a guinea pig a leopard a bat a hedgehog a ferret a raccoon a platypus a fox a wolf a coyote a mole a mink a gopher a sk…