I agree with the first answer they would contrast is correct
Answer:
The function of the appendix is unknown. One theory is that the appendix acts as a storehouse for good bacteria, “rebooting” the digestive system after diarrheal illnesses. Other experts believe the appendix is just a useless remnant from our evolutionary past.
Answer:
a, b-colliding, d -high energy
I am guessing an Ecological Relationship as it is dependent on it's environment
