The diagram shows the changes in foot structure in a bird population over many generations. Time
Time
Present day
How can these changes best be explained?
A
extinction
В.
evolution
C
stable gene frequencies
D.
use and disuse

I’m not exactly sure what your trying to ask, but if it’s how an organelle is similar to a body system or a part a nucleus is like a in function. but i don’t fully understand what you’re trying to ask

Gravitational force i believe

It might. it might because if you think about if they discovered if we came from (lets say something funny like aliens) and thy found cells that matched and they would have t do more research about it but would most probably change their theory.