Before there was evidence from rocks and fossils, many scientists theorized that the continents were once joined together. Using only maps, these
scientists observed that -
1) the oceans have become smaller throughout Earth's history.
2) weathering and erosion have reshaped the surface of the Earth.
3) the continents were all bordered by mountain ranges.
4) the shapes of the continents allowed them to fit together.

uh two lol

the unequal cytoplasmic division that  results  in  one egg  and three polar bodies ensures that a fertilized  egg has  ample nutrients  forits journey  to  the uterus.

i think the answer is 95 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.