AP BIOLOGY

Detailed explanation-1: -Evolution results in progress; organisms are always getting better through evolution. Individual organisms can evolve during a single lifespan. Evolution only occurs slowly and gradually. Because evolution is slow, humans cannot influence it.

Detailed explanation-2: -Charles Darwin understood that evolution was a slow and gradual process. By gradual, Darwin did not mean “perfectly smooth, ” but rather, “stepwise, ” with a species evolving and accumulating small variations over long periods of time until a new species was born.

Detailed explanation-3: -Evolution is a gradual process in which something changes into a different and usually more complex or better form. The mechanisms of evolution include natural selection acting on the genetic variation among individuals, mutation, migration and genetic drift.

Detailed explanation-4: -Evolution has no single schedule. Sometimes, new species or varieties arise in a matter of years or even days. Other times, species remain stable for long periods, showing little or no evolutionary change.

Detailed explanation-5: -“Darwin’s theory of evolution by natural selection predicts gradual and incremental changes to organisms occurring over very long timespans.