Question just about C-14 dating?

C-14 is used to work out the age of something.
So I have a few questions concerning this
--------
a) are the levels of C-14 surrounded by the atmosphere constant (approx) all the time

b) if C-14 makes up 1/100 th of the atmosphere, would it make up 1/100th of natural material
Answers:
Yes, C-14 levels are constant throughout time (approx).

Yes, atmospheric carbon is incorporated into all event. Starts with plants which use it in photosynthesis, then animals put away plants, and animals eat animals etc.

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