Throughout millions of years, earth's organisms have changed and adapted along with the environment in order to thrive and survive. The process of Evolution has produced a diverse world filled with complex Relationships Between Organisms. Why does a lion have sharp teeth and is known as a predator? Why is a gazelle buit for speed to escape? Answers to these Basic Science questions are found in Organisms: Adaptations to Environment and Speciation and Natural Selection. Evolution takes a look at how living forms survived intense living environments and how life is resiliant with change.