Download extinction ls ch7 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
 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