Look at this for ur answer
Answer:
Osmosis is the movement of water from areas of high concentrations to lower concentrations across a semi permeable membrane. It occurs over these membranes in cells of the body alllowing water to move into and out of them.
Explanation:
Whenever the sperm and the egg combine, it is possible for one or the other to not split properly and bring 2 of the chromosomes instead of just 1
Secondary since plants/animals already lived there, but got killed/driven out of the area they lived/thrived in/on.