Answer:
C Darwin
Explanation:
Charles Darwin, the father of evolution theorised that within any population, there exists variation in traits which help the animals adapt to their environment and help them survive.
In the same vein, he believed that the breeds of dogs are all one species, but they have incredible genetic diversity.
Therefore, Charles Darwin first realized that variation mattered, even though he didn't know the exact mechanism.
13) Electrical Energy is turned into Light and Sound, and as always Heat
14)Potential and Kinetic
15)Insulators who do not freely allow electricity to flow freely
