What is the hollow space within the diaphysis of a long bone called?

The hollow region in the diaphysis is called the medullary cavity, which is filled with yellow marrow. The walls of the diaphysis are composed of dense and hard compact bone. ... The outer surface of the bone is covered with a fibrous membrane called the periosteum(peri- = “around” or “surrounding”).

Explanation:

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.

want or the answer