The continents that are now separated by the Atlantic Ocean once formed a single landmass.
All of our current continents were once connected as one single landmass named Pangea. Pangea broke apart into different continents. Fossils found in Africa have been found in South America, and etc.
Their is no genetic diversity and all of the offspring will be the same and also if one parent has a deadly mutation, all of the offspring will get it.
Incomplete dominance refers to pair number 2 about orange cat
polygenic inheritance for pair number 3
codominance for pair number 1
As of right now, the land is pretty spread out. But millions of years ago, like, we're talking dino time, all the land was just one chunk. This chunk was called Pangaea, or Pangea. But before everything split apart into multiple continents, there was just one; a supercontinent. Hope that helps!