What is the purpose of the proper handling of experimental subjects? a. to ensure that the experiment belongs to biology and not to physics b. to ensure that the hypothesis is shown to be correct c. to ensure that other people can read the observations recorded in a data table d. to ensure that good and reliable data are collected

d. to ensure that good and reliable data are collected.

Explanation:

The experimental samples are required to be handled carefully and precautions must be taken so as to avoid contamination. As if contaminants were introduced then it will lead to the error in the observational data.

The properly handled sample will provide data after the experimental process that can be useful in drawing reliable results.

b. the carbon cycle ensures living things have a source of hydrogen