I think it's C., carrying genetic information.
I don't think so, because for every action there is an equal and opposite reaction.
Hope this helps! :)
Answer:
a cat's leg, and a human arm are considered homologous structures.
Explanation:
same joints
muscles are in the same places
There are no choices but examples of biotic factors are trees, mosses, ferns, fungi, mammals, birds, reptiles, worms, plants, and lichens.