Which is a vey slow, naturally occurring environmental change? a. volcanic eruption b. pollution c. climate change d. wetland degradation

Which kind of aquatic ecosystem does the photograph most likely show? a. marsh b. swamp c. lake d. river

Which would prevent a plant from growing

Many organs are involved in the processes of keeping the blood and the body clean. when poisonous or harmful substances are in the blood, they are absorbed by the and released in a less harmful form. when wastes are present in the blood, they are filtered out and removed from the body by the