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Extinction and Adaptation

Extinction and Adaptation. Biodiversity on Earth. What is Biodiversity?. Variety of species of organisms present on Earth. Includes members of all 5 kingdoms Animal – multi-cellular heterotrophs Plant – multi-cellular autotrophs Fungi – multi-cellular saratrophs

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Extinction and Adaptation

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  1. Extinction and Adaptation Biodiversity on Earth

  2. What is Biodiversity? • Variety of species of organisms present on Earth. • Includes members of all 5 kingdoms • Animal – multi-cellular heterotrophs • Plant – multi-cellular autotrophs • Fungi – multi-cellular saratrophs • Protista and Monera – unicellular & simple cellular colonies • AmoebaBacteria

  3. Is Biodiversity Important? • Yes • Think about a food chain • What happens if one “link” is taken out? • Today nearly 2 million species have been discovered and named by scientist. • The number of different species decreases each year. • For more information on importance of biodiversity go to: http://encarta.msn.com/encyclopedia_761579557/Biodiversity.html

  4. Man-Made Pollution Global Climate Changes Over-harvesting Loss of Habitat Invasion Species Natural Global Climate Changes Loss of Habitat Invasion Species Causes of Extinction http://library.thinkquest.org/25014/why/index.html

  5. Survival • When a species changes to live in its environment, it is said to have adapted. • Adaptation can be simple or complicated. • Coral fish • Giraffe

  6. Natural selection • As a species adapts, members that have favorable traits for survival will live to produce offspring, and others will die. • This is how survival adaptations get passed to the next generation. • Coloring schemes • Burrowing and/or sleep habits. • Migration patterns

  7. Human adapt too. • We’ve all heard of the fight or flight response, but what is it? • When humans first started hunting for food, their bodies developed a hormonal response to emergency situations. • Blood vessels dilate, eyes widen, heart and breathing rates increase and muscles tense ready to fight for their life or run.

  8. This response kept the hunters alive. • This response can be seen even in humans today (many thousands of years later) <Demonstration> • Humans are among the best of the animal kingdom at surviving. • Not only do our bodies adapt but we can use our minds to invent and engineer ways of surviving in extreme conditions such as space.

  9. Review • Biodiversity is… • Major causes of extinction… • Adaptation is… • How does adaptation allow for species survival? • Name some ways humans adapt?

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