According to the soil diagram that you drew in your notebook, Horizon b is lighter in color because it has less humus and is less fertile than horizons o and a. True or false?

the best answer is, earth strong )

explanation:

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.

the correct answer is: " ventricles " .

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