I would have to say A. ribosomes are known to break and release their digestive juices into the cell upon cell death. thus killing them
Simplest to complex: atoms, molecules, cells, tissue, organs, organ system, organism
I hope this helps!
A species could gain negative traits through evolution. So, evolution does not always mean progress.
By meiosis 4 gamets are produced four are functional in males amd only one in female in case of humans
The two bird species have similar DNA sequences