Answer:hmm not sure on that one
Explanation:
A closed space zone is one that is obstrutced in some way.
Hope this helps :)
I only know #2 and #4.
2.) cells
3.) cells, life , existing
Sorry that i dont know the rest but i took a test on this not to long ago, and i tend to forget stuff once i take a test on it.
SI will always be in metric, so the answer is D. Meter.
