1. repressor protein is made from.
2. repressor protein is able to bind to the operator region on.
3. functional beta-galactosidase protein could be made from.
4. functional permease protein could be made from.

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.

hybridization actually occurs frequently in nature. evolution is derived from the process of hybridization that creates things with different traits. this leads to the species changing and evolution occurring. hope this : )