One way that cancer can form is when abnormal cells have uncontrolled growth, old cells die and get added on to which I believe creates tumors.
I would go with c because its tells you right in there that the ecosystem help who lives around that area.
Answer:
It could largely impact the way you look.
Explanation:
Since 100% of your DNA decides how you look, if even one thing changes, one part of your look would change. Sometimes it's something big like eye color, or sometimes like a small change in skin color.
4 significant figures I think
