Bioaccumulation. I hope this helps you out :D
That would be B.
A pairs with T(or U in RNA).
C pairs with G.
Many thing, such as cancer and diabetes
Pioneer species. They are the usually the first to grow after an ecosystem has been destroyed(in this case by flood).
Earth is always rotating around the sun that means if it were winter on one side of the world, (that is not on the side of the sun) the other side of the world would be summer, ( the side that the sun is shining on)
