Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

[EX Q]: Question: What is the term for stored energy that an object has due to its position or shape? Answer: potential energy
[EX A]: A: Electric charges flow when they have electric potential energy. Potential energy is stored energy that an object has due to its position or shape.

[EX Q]: Question: What is the connecting piece of a sperm packed with? Answer: mitochondria
[EX A]: The connecting piece of the sperm is packed with mitochondria. Mitochondria are organelles in cells that produce energy. Sperm use the energy to move.

[EX Q]: Question: What are ocean waves mainly caused by? Answer: wind
[EX A]:
Ocean waves are energy traveling through water. They are caused mainly by wind blowing over the water.