1 If people dump wastes and poisonous chemicals into water, tiny animals will eat pollutants in polluted water
2 If tiny animals eat pollutants in polluted water, fish and shellfish will eat tiny animals containing poison in their bodies
3 If fish and shellfish eat tiny animals containing poison in their bodies, people who eat these fish will get some diseases
4 If people who eat these fish get some diseases, they will have to go to hospital
5 If they have to go to hospital, their family memebers will take care of them