Scientists looking at the fossil record observe that in a certain kind of spiny fish, the fish evolves to have a greater number of spines over time. What is a reasonable conclusion from this observation?
A) All fish within the species always have the same number of spines,
B) This kind of spiny fish does not have many predators in its habitat,
C) The habitat of the fish must be going through a rapid change over time,
D) The greater number of spines provides some advantage to the fish,
(help please I gotta submit this soon) ​