At the end of mitosis, 2 identical daughter cells are produced.
Blood is made up of red and white blood cells, platelets and plasma. The plasma consists of water (mostly) and dissolved nutrients. When blood is exposed to air, the blood will clot, due to aggravation of the platelets. Then you get a forming scab that will help heal the part that the blood is being exposed from.
The DNA region is easily accessible
The decrease of biodiversity, messing up the ecosystem in regards to the food web and chain etc.