The illustration shows bones in four animals. The bones labeled as A are known as and offer evidence of a common ancestor.
penguin
А
bat
alligator
human
extinct structures
O sequential structures
analogous structures
homologous structures

i think the answer is 95 hope this

wegner's theory did not explain how the continents could move

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.