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Variations

8-2.1 Explain how biological adaptations of populations enhance their survival in a particular environment. 8-2.7 Summarize the factors, both natural and man-made that can contribute to the extinction of a species. Variations.

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Variations

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  1. 8-2.1 Explain how biological adaptations of populations enhance their survival in a particular environment. 8-2.7 Summarize the factors, both natural and man-made that can contribute to the extinction of a species.

  2. Variations • **There are variations(small differences) among species of similar populations. • Some dogs of the same breed have different color fur coats. • Example: A golden retriever may have red, blonde, or gold colored fur. • Organisms of a species differ from one another in many if their traits.

  3. Adaptations • **An adaptation is a trait that helps an organism survive and reproduce.

  4. Structural adaptations • A structural adaptation involves some part of an animal's body. • Teeth • Body coverings    • Movement

  5. Protective Coloration • Colorationand protectiveresemblance allow an animal to blend into its environment.  • Another word for this might be camouflage.  Their camouflage makes it hard for enemies to single out individuals.  

  6. Behaviour adaptations • Behaviour adaptations include activities that help an animal survive.  • Behaviour adaptations can be learned or instinctive. • Social behaviour   • Behaviour for protection  

  7. Mimicry • Mimicry allows one animal to look, sound, or act like another animal to fool predators into thinking it is poisonous or dangerous.  

  8. Natural Selection • **Natural selection explains this survival and shows how species can change over time. For example, certain traits or adaptations involving color, camouflage, food gathering (beaks and claws) and other physical traits, sensory abilities, or behaviors enhance the survival of a species.

  9. Natural Selection

  10. Natural selection

  11. Natural Selection

  12. Small differences in traits of a species are called • A. variations • B. adaptations • C. natural selection

  13. A trait or behavior that helps an organism survive and reproduce is called: • A. variation • B. adaptation • C. natural selection

  14. A process that explains survival of a species and how a species can change over time is called: • A. variation • B. adaptation • C. natural selection

  15. A species is extinct if no members of that species are still alive. Most organisms that have ever lived on Earth are now extinct. • Natural factors can cause extinctions such as has happened throughout Earth history. • Man-made factors have caused extinctions in more recent times, such as the cutting of the rainforest regions, removing natural habitats, over-harvesting, and pollution.

  16. **Natural factors that cause extinctions: • Volcanoes • Global warming • Global cooling • Changes in oxygen levels in seawater • Meteorite impact

  17. **Man- made factors • Cutting down rainforests • Removing natural habitats • Over harvesting • Removing survival needs

  18. Name three natural factors that cause extinction.

  19. Name three man-made factors that cause extinction.

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