Hugs have 13 pairs of chromosomes. complete this model by writing in the correct number of chromosomes for the
sperm, egg, and fertilized egg of a frog. then write in the type of cell division taking place in the two phases shown in the
model

answer fast

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%

multiply it by 5 in order for you to understand i cant give an exact answer.

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.