1) All plants and algae are well-suited for life in an aquarium a) False b) True  2) Animals provide oxygen and a source of food for plants. a) False  b) True  3) Fish for an aquarium must be carefully chosen. a) False  b) True  4) Living things in an aquarium are chosen to keep the system in balance. a) False b) True 5) They don’t clean the aquarium because the fishes will eat the waste a) True b) False 6) If waste materials build up, the living things in the tank can become unhealthy and they will die. a) True b) False

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