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Evolution of Species and Extinction: Understanding the Variety and Impact

Explore the evolution of species with over time, habitat variations, genetic diversity, and natural selection. Learn the causes and impact of species extinction due to environmental changes and human activities. Discover endangered animals and efforts to prevent extinction.

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Evolution of Species and Extinction: Understanding the Variety and Impact

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  1. CH 7 SEC 3 EVOLUTION OF SPECIES

  2. PICK 4 WORDS AND DEFINE

  3. VARIETY OF SPECIES • HOW MANY MILLIONS OF SPECIES EXIST? • 1.5 MILLION TO??? • KEY- OVER TIME, DIFFERENT ENVIRONMENTS AND GENETIC VARIATION HAVE PRODUCED, THROUGH NATURAL SELECTION, THE VARIETY OF ORGANISMS THAT EXIST TODAY.

  4. CONT’D • HABITAT- IS THE SPECIFIC ENVIRONMENT THAT PROVIDES THE THINGS AN ORGANISM NEEDS TO LIVE, GROW, AND REPRODUCE • KEY-A NEW SPECIES CAN FORM WHEN A GROUP OF ORGANISMS REMAINS ISOLATED FROM THE REST OF ITS SPECIES LONG ENOUGH TO EVOLVE DIFFERENT TRAITS.

  5. CONT’D • GRAPHIC ISOLATION- IS WHEN SOME MEMBERS OF A SPECIES BECOME CUT OFF FROM THE REST OF THE SPECIES (SEE GALAPAGOS ISLANDS) • http://video.nationalgeographic.com/video/places/parks-and-nature-places/coasts-and-islands/ecuador_galapagos/

  6. INFERRING SPECIES RELATIONSHIPS • KEY- SCIENTIST HAVE COMBINED THE EVIDENCE FROM DNA, PROTEIN STRUCTURE, FOSSILS, EARLY DEVELOPMENT AND BODY STRUCTURE TO DETERMINE THE EVOLUTIONARY RELATIONSHIPS AMONG SPECIES • KEY- SCIENTIST GROUP TOGETHER CLOSELY RELATED SPECIES

  7. KEY- All these animals are closely RELATED. CAN YOU NAME THEM?

  8. EXTINCTION OF A SPECIES • EXTINCT- WHEN NO MEMBERS OF A SPECIES ARE ALIVE (WOOLLY MAMMOTHS) • WHAT MAKES A SPECIES EXTINCT? • KEY- EXTINCTION IS CAUSED BY A CHANGE IN A SPECIES ENVIRONMENT. THE MEMBERS OF THE SPECIES MAY NOT HAVE ADAPTATIONS THAT ALLOW THEM TO SURVIVE AND REPRODUCE IN THE CHANGED ENVIRONMENT

  9. WHY IMPORTANT?

  10. NOW EXINCT

  11. EXTINCTION • http://www.brainpop.com/science/ourfragileenvironment/extinction/preview.weml

  12. THERE ARE MANY WAYS EXTINCTION CAN HAPPEN…LIST THE FOLLOWING AND GIVE AN EXAMPLE FOR EACH • A NEW DISEASE EX- A NEW DEADLY VIRUS HAS WIPED OUT A TREE SPECIES • LOSS OF FOOD SOURCE EX? • PREDATORS KILL THEM OFF • HUMAN IMPACT • OVER HUNTING

  13. LIST AND GIVE AN EXAMPLE • DESTRUCTION OF ENVIRONMENT • CLIMATE CHANGE • CATASTROPHIC EVENTS

  14. Cont’d • Climate Change- has been the leading cause of extinction • EX- an area that was once warm and moist becomes cool and dry • Resulting- in plants dying and the animals that feed on those plants dying as well or becoming extinct • KEY- SOME ORGANISMS IN A SPECIES MAY HAVE TRAITS THAT HELP THEM SURVIVE IN A CHANGED ENVIRONMENT.

  15. HORSESHOE CRABS HAVE SURVIVED MANY CLIMATE CHANGES

  16. HORSESHOE CRAB HOW OLD ARE THEY?

  17. RECENTLY EXTINCT ANIMALS • http://listverse.com/2009/07/25/10-recently-extinct-animals/ • http://www.youtube.com/watch?v=0Kwzg8WmSEU • http://news.discovery.com/videos/why-tell-me-why-mass-extinction.html

  18. LIST 4 ANIMALS ENDANGER OF EXTINCTION TODAY AND WHY

  19. RACING EXTINCTION • https://vimeo.com/95903058

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