The answer is A i believe
Answer:
C. Radioactive dating
I know this because radioactive dating is done by examining the atomic particles found in an object. The atomic particles decay over time at a predictable rate. Scientists are able to measure the rate of decay to establish the age of the fossil, organism, and/or material.
1.autotrophs
2.both autotrophs and heterotrophs
3.heterotrophs
4.autotrophs
5.autotrophs
6.both heterotrophs and autotrophs