Darwinism is a theory that explains the evolution of organisms.

He gave me a detailed explanation of the problem.

He explained the problem.

Living organisms have evolved over millions of years.

Living organisms evolve over time.

He is good at explaining that theory.

What is this organism?

Neo-Darwinism is a branch of evolutionary theory that combines the theories of natural selection and genetics.

Please read this instruction manual carefully before using the product.

He is reading a book about the theory of evolution.