HELP ME I WILL GIVE YOU BRAINLIEST 1- Which of the following is the best evidence that two birds belong to the same species?
A. The two birds eat the same food.
B. The two birds have common behaviors.
C. The two birds are the same size and color.
D. The two birds mate and produce fertile offspring.

I think it is B let me know if I’m wrong

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on