How to keep rivers or lakes clean. i don't ant any answer from google i want you to think and answer
atleast 3 points

answer:

they use some chemical and spread it onto the water near the bank   and as the water moves it spreads. that or the organisms living in it keep it clean.

explanation:

answer:

deal with chemicals and medicines properly and don't litter

explanation:

shower, toothbrush, toasters, refrigerators,   and the lights

you use the lights to see and brighten a room. and with out them you cant see. you need a toothbrush to clean your teeth with out it stinky breath. shower to wash ya self and without it you stink. toaster to toast stuff without it nothing is toasted. and the refrigerator to keep stuff cold without it everything goes bad

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explanation: