I believe that the answer is B
I hope this helps. :)
Answer:

Step-by-step explanation:
By definition composite function would be:

Then, if g(2)=3 and f(3)=16, therefore for f(g(x)):
Complimentary means 90 degree angle so 90-41.4= the complimentary angle which is 48.6. Supplementary means 180 degrees so 180-41.4= the supplementary angle which is 138.6..
I believe it is use sugar and and release carbon. We breath in oxygen so you know it can’t be anything where we release oxygen. And I don’t know how we could release nitrogen so I would go with the second one