An object is subjected to an unbalanced force. What happens to the object A- The object changes speed or direction.

B- The object continues moving at a constant speed.

C- Nothing changes.

If an object has a net force acting on it, it will accelerate. The object will speed up, slow down or change direction. An unbalanced force (net force) acting on an object changes its speed and/or direction of motion. An unbalanced force is an unopposed force that causes a change in motion.

"d.) carbon dioxide and hydrogen sulfide"

the fossil record provides evidence of a common ancestor to many species.