10.1 KEY CONCEPT There were theories of biological and geologic change before Darwin.

Early scientists proposed ideas about evolution Early scientists proposed ideas about evolution

• EvolutionEvolution = biological change-- process by = biological change-- process by which descendants come to differ from their which descendants come to differ from their ancestorsancestors

• SpeciesSpecies = a group of organisms that can = a group of organisms that can reproduce and have fertile offspringreproduce and have fertile offspring

Many important naturalists in the 18th century! Oh Yeah!!Many important naturalists in the 18th century! Oh Yeah!!

classificatioclassification system n system from from kingdom to kingdom to speciesspecies

Species Species shared shared common common ancestors ancestors rather than rather than arising arising separatelyseparately

More More complex complex forms forms developedeveloped from d from less less complexcomplex

Envtal.Envtal.changes changes lead to lead to use or use or disuse disuse of of structurstructuree

Theories of geologic change set the stage for Darwin’s theory!!

Let’s check these Let’s check these theories out!!!theories out!!!

– Volcanoes, Volcanoes, floods, floods, earthquakeearthquakess

– thought to thought to cause mass cause mass extinction!!extinction!!

Change Change occurred occurred by small by small steps steps over over time!!!time!!!

Geological Geological processes processes (still (still occurring), occurring), add up to add up to cause cause change!!change!!

Prevailing theory Prevailing theory today!!!today!!!

Opener, Wed., Nov. 16th

Watch the video, write down your observations!!

• http://www.arkive.org/ground-pangolin/smutsia-temminckii/video-00.html

10.2 KEY CONCEPT 10.2 KEY CONCEPT Darwin’s voyage provided insight on Darwin’s voyage provided insight on evolution.evolution.

Hmm...Darwin Hmm...Darwin observedobserved differences among differences among island species. island species.

difference in a physical difference in a physical trait.trait.

Live in areas w/ tall Live in areas w/ tall plants = long plants = long necks/legs! (short necks/legs! (short plants plants short short neck/legs!)neck/legs!)

Live in areas w/ certain Live in areas w/ certain foods = different beaksfoods = different beaks

feature that allows organism to better survive in its environment.

-Species are able to adapt to their environment.

-Adaptations can lead to genetic change in a population.

Fossils of extinct Fossils of extinct animals that animals that resemble modern resemble modern animalsanimals

• Darwin found fossil Darwin found fossil shells shells high uphigh up in in the Andes the Andes mountains! mountains!

• saw land saw land move from move from underwater to underwater to above sea above sea level due to level due to an an earthquake!!! earthquake!!!

• extended his extended his observations observations to the to the evolution of evolution of organisms!organisms!

Darwin’s observations made people think,

and still DOES!!

Quick review!!!Quick review!!!• What is evolution?What is evolution?• Define a species!Define a species!• What was Darwin’s theory?What was Darwin’s theory?• What did Linneaus come up with that we still use?What did Linneaus come up with that we still use?• What was Lamarck’s take on evolution?What was Lamarck’s take on evolution?• What did Buffon think was really going on?What did Buffon think was really going on?• What are the 3 theories of geologic change?What are the 3 theories of geologic change?• Which one’s the most supported today?Which one’s the most supported today?• Give an example of variation among species that Give an example of variation among species that

Darwin observed and why this occurred!!!Darwin observed and why this occurred!!!• What is an adaptation and how do SPECIES (not What is an adaptation and how do SPECIES (not

individuals!!) seem to adapt?individuals!!) seem to adapt?

Let’s Let’s explore explore

EVOLUTIONEVOLUTION!!!!

http://www.pbs.org/wgbh/nova/http://www.pbs.org/wgbh/nova/evolution/darwins-predictions.evolution/darwins-predictions.htmlhtml