If proteins could fold only into rigid, inflexible structures, how might this affect the cell's ability to regulate their function?

A protein activity is regulated by controlling when or where it is folded into its active form. Many proteins are in a flexible, inactive form until bound to molecules or ions. If proteins has only a single, inflexible folded conformation, this type  of control could not occur.

i think the answer is g1

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.