Because of base pairing in dna, the percentage of A adenine molecules in DNA is about equal to the percentage of guanine molecules B pyrimidines in dna is about equal to the percentage of purines C purines in dna is much greater than the percentage of pyrimidines D cytosine molecules in dna is much greater than the percentage of quanine molecules

47

explanation:

ok

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.

i would think a oil tanker that has leaked in a bay

answerglucose;