Answer:
d ferret is an exotic animal
Nutrients move through the ecosystem<span> in biogeochemical </span>cycles<span>. A biogeochemical </span>cycle<span> is a circuit/pathway by which a </span>chemical<span> element moves through the biotic and the abiotic factors of an</span>ecosystem<span>. It is inclusive of the biotic factors, or living organisms, rocks, air, water, and </span>chemicals<span>.</span>
If multiple researches obtained the same result, it means that the test is highly repeatable ! Highly repeatable results are always very welcomes, because people believe that they have a high validity and high credibility.
So the correct answer is:
<span>a) Discoveries are more credible when they are independently verified</span>
