[stuartcr]

Your first paragraph makes it sound like one of those two choices is correct, and an explanation is required. That is not true, we do not know the origin. Schools should simply explain both theories, and when asked by the students, truthfully answer that it is unknown, and simply a matter of what you choose to believe. There is no need to be correct about an unknown.

[Dimensio]

Schools should simply explain both theories

I'm aware of evolutionary theories (there are more than one), but I'm not aware of a duality. What is this "other" theory?