Evolution and Natural Selection

Cha-cha-cha-cha-changes! Ever wonder why there are more and more cases of drug resistant bacteria? Ever think to yourself how there are so many different living things things on Earth? From oak trees to dogs to slime molds to flesh eating bacteria, scientists estimate there could be nearly 9 million different types of living things on our planet! How did we get all this diversity? Scientists explain the variety of life with the theory of evolution, Over long periods of time, species change. These changes are based of the traits and adaptations that allow organisms to survive best in their environment. Over time, this creates new kinds of species.