Have a control. You have to have something to compare your experimental results or else your results could be random chance.
Answer:
B.
artificial selection
Explanation:
Artificial selection is often utilized in crop and animal farming to obtain favorable traits in organisms. Organisms with desirable traits are selected and crossed with each other. Since the selection is done by humans and not by natural processes, it is called artificial selection.
In the given case, the farmers select corn plants with large ears. The selected plants are crossed with each other so that the next generation has the maximum chances of producing large ears. Hence, artificial selection is used here.
Full moon. a full moon happen quite often.
<span>No, if new evidence is acquired or new perspectives emerge, scientific ideas can be revised or replaced;</span> as new ideas are introduced, scientists rethink and experiment to prove the hypotheses, and if the evidence is proven true many times, scientific ideas are revised, but not eliminated completely. So science can never be completely true, the ideas are just theories humans try to prove to examine how the universe works.
Answer: Magnetic field data