Your Inner Fish

Chapter 4: “Teeth Everywhere”

Abbe Dembowitz AP Bio 9/14/10

You might’ve thought that

she

introduced teeth to the world… peelinganorangewithascrewdriver.blogspot.com

…but you were sadly mistaken…

The harder the tooth, the better the fossil

•

Rocks and teeth: preservation wise, they’re one in the same

• “Bigger creatures into smaller pieces” • Eating Habits: •Carnivores- Sharp blades •Herbivores- flat, square answers.com

http://sites.google.com/site/fossiliveraci english/meg,wehardlyknewye

Conodonts?

Did you mean: condiments?

•

Fossils found in ancient oceans

• “small shelly organisms with a series of spikes

projecting out of them,” (75)

• The lamprey • The evolved jaw and Trithelodont •Single root at base of tooth: reptile •Bumps and ridges- mammal http://dobrinishte.org/fishes/ eeob.iastate.edu

“We would never have scales, feathers, and breasts if we didn’t have teeth in the first place,” (79)

cartoonstock.com

•

“The developmental tools that make teeth have been repurposed to make other important skin structures” (80)

•Teeth: Development b/w layers of tissue in skin •Other: Development from the interactions b/w layers of skin •Acquiring of their prey

Take a look at your teeth…

whyfiles.org http://www.nhm.ac.uk/nature-online/species-of-the-day/evolution/index.html

Do they look like this?

..Introduce evolution and….

faculty.ksu.edu.sa kent.ac.uk

Evolution over time

1. Little fish developed armor 2.Big fish obtained bigger jaws to crack the armor tudorplace.com.ar

• 3. Competition arises and animals evolve POPTIMAL .

COM checkyourodds.co.uk

Sources

•

Your Inner Fish

by Neil Shubin, Vintage Books, Random House, New York, 2009 (Pgs. 60-80)