Darwin's Theory

Explore Darwin's Theory of Evolution with our fill-in-the-blanks worksheet!

Use your notes and pages 460 through 464 in your text book to fill in the blanks with the correct word or phrase. 1. Because there is an overproduction of offspring, organism must compete for limited resources.2. Individuals of a species have differences in their traits. this difference is called variation.3. Inherited traits that increase an organism's ability to survive and reproduce are called adaptations.4. The ability to survive and reproduce in a specific environment is called an individuals fitness.5. The fact that only the fittest organisms live to reproduce and pass on their adaptive traits is known as the survival of the fittest.6. Darwin published his theory in a book call "On the Origin of Species"7. Darwin said that evolution occurs by the process of natural selection.8. Every organism alive today descended from ancestors that survived and reproduced.9. Over generations, adaptations could cause successful species to evolve onto new species.10. Common descent suggests that all species, living and extinct are related.11. The principle that living species descend, with changes, from other species over time is referred to as descent with modification.12. The fossil record provides evidence of descent with modification over long periods of time.