Answer:
I think its D. Artificial Selection
Explanation:
Sorry if this didn't helped you.
It would be the urinary tract
I would say B, <span>differ greatly between single solar systems. As we all know, I believe this is the only planet with life, but there might be many out there, too. Each planet should have very different characteristics unlike ours. So it may vary.</span>
Bacteria's cell wall is made of peptidoglycans; among protists Algae have cell walls made of cellulose.
Fungi's cell wall is made up of chitin.
Plants cell wall is made of cellulose.