In the Florida map shown below, use the law of superposition to determine which rocks are oldest? Map of Florida identifying four different kinds of rock strata. The top layer of quaternary rock is labeled A; the bottom layer of quaternary rock is labeled B; the top layer of tertiary rock is labeled C; the bottom layer of tertiary rock is labeled D. Public Domain A B C D

The answer is A

Explanation:

You can tell that rocks are older or younger depending on if other layers overlap. B is the oldest because all the others cover it, C is the second youngest because D and A overlap it. From what I could tell, when I took the test, it was either A or D, neither overlap each other so I was not sure so I guessed A and got it right. Though it could be looked at that A is smaller than D since its still growing and building.  

where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?