Question

Changes in the trilobite exoskeleton can be attributed to ____.

a.
changing environments
c.
inter-species mating
b.
competition for survival
d.
both a and b


Please select the best answer from the choices provided

A
B
C
D

Answer 1

It Would be D. Both a and b

Answer 2

I think it is D because the exoskeleton is used for protection and sensing things, it could be just B but I think D is the best answer