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CH 7 SEC 3

CH 7 SEC 3. EVOLUTION OF SPECIES. PICK 4 WORDS AND DEFINE. 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. CONT’D.

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CH 7 SEC 3

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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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