Answer:
squamous epithelium maybe
Ok here we go:
Science starts with observing which leads to hypothesis, which is tested by experiments.
The other two i am not sure of. Hope i was a help to you. One thing you can do to figure out the other two is google: "what type of science includes medicine and envirnmental science", and do the same for the other one.
C, the first two don't make sense and the last one would support the opposing view point.
Answer:
D, they are all the same size.