Answer:
exposure learning. constant exposure raises propinquity in a persons subconcoius
with the certian topic Explanation:
I would say B.
A, umm, don't crash trains, that's bad.
C, Lillian is wondering how fast a train can go, not at what curve will it fall.
D, Lillian isn't wondering about the size of the trains, just the speed.
Answer: Some sticklebacks were stranded in lakes that were formed in the ice age
I believe it is the retina that changes shape to focus on distant objects.