a frog is a kind of aquatic animal & a mountain chorus frog is a kind of frog ->  a mountain chorus frog is a kind of aquatic animal  a mountain chorus frog is a kind of aquatic animal & bodies of water are the habitats for aquatic animals ->  bodies of water are the habitats for mountain chorus frogs  bodies of water are the habitats for mountain chorus frogs & a mountain chorus frog is a kind of animal & pollutions in animals habitat can cause the population of animals to decrease ->  water pollution in bodies of water can cause the population of mountain chorus frogs to decrease  water pollution in bodies of water can cause the population of mountain chorus frogs to decrease & polluting means something poisonous is added to an environment & a body of water is a kind of environment -> poisonous things added in water can cause the population of mountain chorus frogs to decrease