After three half-lives have elapsed, what fraction of the original amount of radionuclide remains? 1/3
1/4
None of these
1/8

There is no reason to think the results are biased or not conducted properly but you should not assume the results are correct just because they were done in a laboratory so the answer would be c. it is likely to be reliable because the results support the conclusion presented.

Combustion is the act or process of burning. therefore, i believe the answer is  a: burning wood. 

Answer(28.02g/mol);