I believe the answer is b) diploid.
the prefix "di" means two. You could remember it that way :)
Answer:
Principle of diminishing returns
Explanation:
In this case, Initial inputs of energy, water, fertilizer, and pesticides on high-yield crop varieties would produced high crop yields. As time goes on further adidtion of these same inputs of production would give the same or a lower yields of crops. Therefore, obeying the Principle of diminishing returns.
I think the Answer is truly B.
Bacteria
Amphibians
Reptiles
Mammals