In humans tongue rolling is dominant to the inability to tonunge to if a heterozygous tongue roller and a non roller have a child what are the chances the child will be a non-tongue roller

hello

answer: collecting information/data

reason: the student is going around and asking people questions to collect data

i hope this

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.