First is england builds many factories during the industrial revolution. this puts tons of pollution in the air. Second is after several generations, most moths in england are black in color. Third is the trees in england are white, the black moths are eaten by birds more frequently because they cannot blend into their environment. The 4th is the trees in england are black. the black moths can blend into their environment. The last one is more black moths live and reproduce. many white moths are eaten.
I think you're talking about histones. Histones are proteins found in eukayotic cell nuclei. Histones are what DNA wrap around so it fits inside the nucleus and helps with the formation of chromosomes.
