In a well-balanced ecosystem, squirrels eat nuts, raccoons feed on squirrels, and bears feed on raccoons. it was observed that there were more squirrels and fewer raccoons. this situation indicates that . the least amount of energy from the sun will be received by the .

➷ This situation would indicate that the squirrels are at a lower trophic level than the raccoons. The least amount of energy from the Sun will be received by the bear. This is because it is the highest in this food chain. As you go up a food chain, the amount of energy passed on to the consumer reduces (roughly 10% is passed on.) Based on these ideas, it would be the bear.

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they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.