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Why do organisms change? Natural Selection in Action • The THEORY OF NATURAL SELECTION explains how a population changes in response to its environment. • What are some of the factors that causes changes in the environment? Let’s Brainstorm Changes in Population Hunting Ex. Elephants in Uganda hunted for ivory Trophy buck management Resistance Pesticides and antiobiotics Competition More colorful males attract the females-peacocks What about humans? How do we pick mates? Why can do some organisms like insects and bacteria develop resistance and change so quickly? They have very short generation times. Generation time is the period between the birth of one generation and the birth of the next generation. Speciation-The formation of a new species as a result of evolution How do new species form? Separation sepaated Once separated 1. Canyon 2. Mountain Range 3. Lake Adaptation Division The two groups may not be able to interbreed anymore. Time and many generations Over many generations, th separated groups may evolve different sets of traits. If the environmental conditions are different fo