if there weren't alleles for different traits, but rather only one verison of a gene for different, how would humans be different? Justify your answer

geologic time scale (for gradpoint) =)

you should wear a lead protective shield when having teeth x-rays

hope i

-lavira : )

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.