The earth’s atmosphere contains about 0.04% (or 400 parts per million) carbon dioxide. although most of the carbon dioxide is in the form 12co2, which is not radioactive, a specific fraction of the total is made up of radioactive 14co2.
a) true
b) false

True

Explanation:

Yes the given statement is true

Most of the carbon dioxide preset in the atmosphere is C12 isotope and a very small fraction of The atmosphere is made up by C14 isotope which is radioactive in nature

C14 makes about 1 to 1.5 atoms per atoms of carbon in the atmosphere.

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

i believe the answer is c. "baking" is the gerund, while "baking blueberry muffins" would be the gerund phrase. hope this ! : )