Which of the following is not a human use of wetlands?
a. petroleum exploration
b. recreational boating
c. juvenile fish nursery
d. shipping waterway
*it is not "a" or "b" , i put those and it was marked wrong*

I can help with the first one and third for you.

Symbol |  atomic # | Mass of # | # of Protons | # of electrons | # of neutrons

Na        |   11      |   23 (when rounded)  | 11  |                     11       | 12

Sr        |  38     |   88 (when rounded)   | 38 |                    38     | 50

(sorry if this didn't help)