Answer:
They have increased the amount of certain organisms (a lot of crops and such) and made the soil healthier. Also, other organisms that may feed on this are having more food.
Explanation:
Protozoans, bacteria, fungi... viruses are not organisms
<span>Dr. Nelson studies the psychological factors that seem to be associated with the development of heart disease. Dr. Nelson specializes in health psychology.</span>
C. It’s good to repeat experiments in case you miss something or something was off
