Stripped of all misconceptions, evolution is like the growth of an oak or the laughter of a child. It is a natural phenomenon that is abundantly apparent to everyone who has an open eye and an open mind. Thousands of persons have observed it and used it to their advantage. Evolution simply means change. The growth of the oak and the laughter of the child are familiar examples of natural change that is going on around us at all times.
Nature has no other phenomena that are more ubiquitous and easily observed than change.
There are theories about how evolution works but these are not properly called the theory of evolution. The best known theories about how evolution works are those that were proposed by Charles Darwin. They are properly called the Theory of Natural Selection and the Theory of Sexual Selection. The wise teacher also needs to know the meaning of the word theory. Wild guesses are not the stuff of which science is made.