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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 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. 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/coastsand-islands/ecuador_galapagos/ 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 KEY- All these animals are closely RELATED. CAN YOU NAME THEM? 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 WHY IMPORTANT? NOW EXINCT EXTINCTION http://www.brainpop.com/science/ourfragil eenvironment/extinction/preview.weml 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 LIST AND GIVE AN EXAMPLE DESTRUCTION OF ENVIRONMENT CLIMATE CHANGE CATASTROPHIC EVENTS 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. HORSESHOE CRABS HAVE SURVIVED MANY CLIMATE CHANGES HORSESHOE CRAB HOW OLD ARE THEY? RECENTLY EXTINCT ANIMALS http://listverse.com/2009/07/25/10recently-extinct-animals/ http://www.youtube.com/watch?v=0Kwzg8 WmSEU http://news.discovery.com/videos/why-tellme-why-mass-extinction.html LIST 4 ANIMALS ENDANGER OF EXTINCTION TODAY AND WHY RACING EXTINCTION https://vimeo.com/95903058