I believe the answer to this question is D, I am not sure though.
Answer:
Because of the change in density. Oceanic-continental convergance allows for 1 plate to slide under while continental to continental can not slide under and thus they collide froming features like mountins and other stuff.
explanation:
It's a biologist (a person that studies living organisms and systems)
The graph is showing us the tide height in feet in the left side and the hight up and down.
