Interactions between species are what define ecological communities, and community ecology studies these interactions anywhere they take place. Although interspecies interactions are mostly competitive, competition is pretty dangerous, so a lot of interactions are actually about side-stepping direct competition and instead finding ways to divvy up resources to let species get along. Feel the love?

Like CrashCourse! http://www.facebook.com/YouTubeCrashCourse
Follow CrashCourse! http://www.twitter.com/TheCrashCourse

Table of Contents
1) Competitive Exclusion Principle 2:02
2) Fundamental vs. Realized Niche 3:48
3) Eco-lography / Resource Partitioning 5:25
4) Character Displacement 7:29
5) Mutualism 9:15
6) Commensalism 9:55

References for this episode can be found in the Google document here: http://dft.ba/-2YuA

crashcourse, ecology, biology, competition, evolution, survival, habitat, species, interaction, communities, community ecology, resource, animal, limiting factors, competitive exclusion principle, success, paramecium, competitive advantage, extinction, food, prey, diversity, life, adaptation, niche, security, stability, fundamental niche, realized niche, conflict, nature, natural order, robert macarthur, warbler, ecologist, yale, resource partitioning, observation, zone, hunting, foraging, coexist, organism, selection, character displacement, peter grant, rosemary grant, galapagos finches, trait, mutualism, commensalism, mycorrhizae, termite, obligate mutualism, barnacle Support CrashCourse on Subbable: http://subbable.com/crashcourse

In which John Green teaches you the history of Christianity, from the beginnings of Judaism and the development of monotheism, right up to Paul and how Christianity stormed the Roman Empire in just a few hundred years. Along the way, John will cover Abram/Abraham, the Covenant, the Roman Occupation of Judea, and the birth, life, death and legacy of Jesus of Nazareth. No flame wars! Let's keep the commentary civil.

Crash Course World History is now available on DVD! http://store.dftba.com/product....s/crashcourse-world-

Follow us!
@thecrashcourse
@realjohngreen
@raoulmeyer
@crashcoursestan
@saysdanica
@thoughtbubbler

Like us! ‪http://www.facebook.com/youtubecrashcourse
Follow us again! ‪http://thecrashcourse.tumblr.com
Support CrashCourse on Patreon: http://patreon.com/crashcourse

Get ready for hilarity, because this week, we're diving head first into Greek Comedy. Actually, though, maybe don't get TOO ready for hilarity. Taste in humor has changed a little over the last couple of thousand years. You already know about Greek Tragedies, with their hamartia and catharsis and whatnot. Today we're going to look at how Greek comedy evolved out of those tragedies, first as Satyr plays, and later as full-blown comedies. So come along. There are a few laughs involved, I promise.

Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse

Thanks to the following Patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:

Mark Brouwer, Nickie Miskell Jr., Jessica Wode, Eric Prestemon, Kathrin Benoit, Tom Trval, Jason Saslow, Nathan Taylor, Divonne Holmes à Court, Brian Thomas Gossett, Khaled El Shalakany, Indika Siriwardena, Robert Kunz, SR Foxley, Sam Ferguson, Yasenia Cruz, Daniel Baulig, Eric Koslow, Caleb Weeks, Tim Curwick, Evren Türkmenoğlu, Alexander Tamas, Justin Zingsheim, D.A. Noe, Shawn Arnold, mark austin, Ruth Perez, Malcolm Callis, Ken Penttinen, Advait Shinde, Cody Carpenter, Annamaria Herrera, William McGraw, Bader AlGhamdi, Vaso, Melissa Briski, Joey Quek, Andrei Krishkevich, Rachel Bright, Alex S, Mayumi Maeda, Kathy & Tim Philip, Montather, Jirat, Eric Kitchen, Moritz Schmidt, Ian Dundore, Chris Peters, Sandra Aft, Steve Marshall
--

Want to find Crash Course elsewhere on the internet?
Facebook - http://www.facebook.com/YouTubeCrashCourse
Twitter - http://www.twitter.com/TheCrashCourse
Tumblr - http://thecrashcourse.tumblr.com
Support Crash Course on Patreon: http://patreon.com/crashcourse

CC Kids: http://www.youtube.com/crashcoursekids

In our first episode of Crash Course Engineering, Shini explains what engineering is, and gives a brief overview of its four main branches (civil, mechanical, electrical, and chemical) as well as a look at some of the other fields of engineering.

Crash Course Engineering is produced in association with PBS Digital Studios: https://www.youtube.com/playli....st?list=PL1mtdjDVOoO

***

RESOURCES:
https://www.britannica.com/technology/engineering
http://www.dictionary.com/browse/engineer
http://enacademic.com/dic.nsf/enwiki/23915
https://www.britannica.com/tec....hnology/military-eng
https://www.britannica.com/tec....hnology/civil-engine
https://www.bls.gov/ooh/archit....ecture-and-engineeri
http://me.columbia.edu/what-mechanical-engineering
https://www.britannica.com/tec....hnology/history-of-t
https://www.livescience.com/44....186-who-invented-the
https://www.britannica.com/technology/steam-engine
https://www.acs.org/content/ac....s/en/careers/college
https://www.livescience.com/47....499-what-is-engineer
https://www.livescience.com/48....134-what-is-chemical
https://www.livescience.com/47....702-aerospace-engine
https://www.livescience.com/47....749-nuclear-engineer
https://www.livescience.com/48....001-biomedical-engin
http://time.com/money/4920319/....the-1-college-major-
https://www.forbes.com/sites/k....arstenstrauss/2017/0
“The Story of Engineering” by James Kip Finch. Anchor Books, 1960.

***

Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse

Thanks to the following Patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:

Mark Brouwer, Glenn Elliott, Justin Zingsheim, Jessica Wode, Eric Prestemon, Kathrin Benoit, Tom Trval, Jason Saslow, Nathan Taylor, Divonne Holmes à Court, Brian Thomas Gossett, Khaled El Shalakany, Indika Siriwardena, SR Foxley, Sam Ferguson, Yasenia Cruz, Eric Koslow, Caleb Weeks, Tim Curwick, Evren Türkmenoğlu, D.A. Noe, Shawn Arnold, mark austin, Ruth Perez, Malcolm Callis, Ken Penttinen, Advait Shinde, Cody Carpenter, Annamaria Herrera, William McGraw, Bader AlGhamdi, Vaso, Melissa Briski, Joey Quek, Andrei Krishkevich, Rachel Bright, Alex S, Mayumi Maeda, Kathy & Tim Philip, Montather, Jirat, Eric Kitchen, Moritz Schmidt, Ian Dundore, Chris Peters, Sandra Aft, Steve Marshall
--

Want to find Crash Course elsewhere on the internet?
Facebook - http://www.facebook.com/YouTubeCrashCourse
Twitter - http://www.twitter.com/TheCrashCourse
Tumblr - http://thecrashcourse.tumblr.com
Support Crash Course on Patreon: http://patreon.com/crashcourse

CC Kids: http://www.youtube.com/crashcoursekids

Today we’re looking at silicon, and how introducing small amounts of other elements allow silicon layers to conduct currents, turning them into semiconductors. We’ll explore how putting two different types – N and P semiconductors – together gives us electrical components like diodes, transistors, and solar cells.

Crash Course Engineering is produced in association with PBS Digital Studios: https://www.youtube.com/playli....st?list=PL1mtdjDVOoO

Check out Reactions: https://www.youtube.com/channe....l/UCdJ9oJ2GUF8Vmb-G6

***

RESOURCES:
https://www.nobelprize.org/nob....el_prizes/physics/la
https://www.nobelprize.org/nob....el_prizes/physics/la
https://www.explainthatstuff.c....om/howtransistorswor
https://www.acs.org/content/ac....s/en/education/resou
http://butane.chem.uiuc.edu/ps....hapley/Environmental

***

Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse

Thanks to the following Patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:

Mark Brouwer, Kenneth F Penttinen, Trevin Beattie, Satya Ridhima Parvathaneni, Erika & Alexa Saur, Glenn Elliott, Justin Zingsheim, Jessica Wode, Eric Prestemon, Kathrin Benoit, Tom Trval, Jason Saslow, Nathan Taylor, Brian Thomas Gossett, Khaled El Shalakany, Indika Siriwardena, SR Foxley, Sam Ferguson, Yasenia Cruz, Eric Koslow, Caleb Weeks, D.A. Noe, Shawn Arnold, Malcolm Callis, Advait Shinde, William McGraw, Andrei Krishkevich, Rachel Bright, Mayumi Maeda, Kathy & Tim Philip, Jirat, Ian Dundore
--

Want to find Crash Course elsewhere on the internet?
Facebook - http://www.facebook.com/YouTubeCrashCourse
Twitter - http://www.twitter.com/TheCrashCourse
Tumblr - http://thecrashcourse.tumblr.com
Support Crash Course on Patreon: http://patreon.com/crashcourse

CC Kids: http://www.youtube.com/crashcoursekids

This week on Crash Course Mythology, we're getting urban. Mike Rugnetta is the man with the orange umbrella who's about to give you a free tour of mythical cities. We'll talk about a few cities that didn't exist, but we're going to focus on real cities with mythical founding stories. We'll talk about Jericho, Jerusalem, and Rome, among others.

Crash Course is made with Adobe Creative Cloud. Get a free trial here: http://www.adobe.com/creativecloud.html

Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse

Thanks to the following Patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:

Mark Brouwer, Divonne Holmes à Court, Brian Thomas Gossett, Khaled El Shalakany, Indika Siriwardena, Robert Kunz, SR Foxley, Sam Ferguson, Yasenia Cruz, Daniel Baulig, Eric Koslow, Caleb Weeks, Tim Curwick, Jessica Wode, Cami Wilson, Eric Prestemon, Evren Türkmenoğlu, Alexander Tamas, Justin Zingsheim, D.A. Noe, Shawn Arnold, Tom Trval, mark austin, Ruth Perez, Malcolm Callis, Kathrin Janßen, Ken Penttinen, Advait Shinde, Cody Carpenter, Annamaria Herrera, Nathan Taylor, William McGraw, Bader AlGhamdi, Vaso, Melissa Briski, Joey Quek, Andrei Krishkevich, Rachel Bright, Alex S, Mayumi Maeda, Kathy & Tim Philip, Montather, Jirat, Eric Kitchen, Moritz Schmidt, Ian Dundore, Chris Peters, Sandra Aft, Jason A Saslow, Steve Marshall
--

Want to find Crash Course elsewhere on the internet?
Facebook - http://www.facebook.com/YouTubeCrashCourse
Twitter - http://www.twitter.com/TheCrashCourse
Tumblr - http://thecrashcourse.tumblr.com
Support Crash Course on Patreon: http://patreon.com/crashcourse

CC Kids: http://www.youtube.com/crashcoursekids

Today we’ll continue to explore sociology’s founding theorists with a look at Karl Marx and his idea of historical materialism. We’ll discuss modes of production, their development, and how they fit into Marx’s overall theory of historical development, along with class struggle and revolution. We’ll also discuss how Marx’s ideas gave rise to Gramsci’s idea of hegemony, and to conflict theories more generally.

Crash Course is made with Adobe Creative Cloud. Get a free trial here: https://www.adobe.com/creativecloud.html



***

Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse

Thanks to the following Patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:

Mark, Les Aker, Bob Kunz, William McGraw, Jeffrey Thompson, Ruth Perez, Jason A Saslow, Eric Prestemon, Malcolm Callis, Steve Marshall, Advait Shinde, Rachel Bright, Ian Dundore, Tim Curwick, Ken Penttinen, Dominic Dos Santos, Caleb Weeks, Kathrin Janßen, Nathan Taylor, Yana Leonor, Andrei Krishkevich, Brian Thomas Gossett, Chris Peters, Kathy & Tim Philip, Mayumi Maeda, Eric Kitchen, SR Foxley, Justin Zingsheim, Andrea Bareis, Moritz Schmidt, Bader AlGhamdi, Jessica Wode, Daniel Baulig, Jirat
--

Want to find Crash Course elsewhere on the internet?
Facebook - http://www.facebook.com/YouTubeCrashCourse
Twitter - http://www.twitter.com/TheCrashCourse
Tumblr - http://thecrashcourse.tumblr.com
Support Crash Course on Patreon: http://patreon.com/crashcourse

CC Kids: http://www.youtube.com/crashcoursekids

Mini aventuras de Winnie the Pooh - La expedición
¿Listo para escuchar una historia ? Viaja al bosque de los Cien Acres, para vivir otra divertida aventura junto a Winnie the Pooh y sus amigos! Las Mini aventuras de Winnie the Pooh, en Disney Junior!

Sitio Oficial: http://www.disneylatino.com/disneyjunior/

Síguenos en Facebook: http://www.facebook.com/DisneyJuniorLatinoamerica

¡Haz click en el botón SUSCRIBIR y entérate de los nuevos videos de Disney Junior en Youtube!

Descubre La Bella y la Bestia, la historia de Bella, una joven lectora que sueña con vivir aventuras como las que lee en sus libros y siempre ve más allá de las apariencias. Cuando Bella encuentra a su padre prisionero y enfermo en el castillo encantado de una horrible Bestia, se ofrece a tomar su lugar. Con compasión y amabilidad, Bella le enseña a la Bestia a descubrir su belleza interior y a amar a otra persona, ayudándolo a romper el hechizo antes de que caiga el último pétalo de una rosa encantada.



#SoyPrincesaSiendoYo
#DescubriendoLaBellaylaBestia

Angie fue a conocer a la tripulación del Junior Express pero no lograba despegarse del celular. ¡Mira como el Capitán Topa y Harmony la ayudarán a conectarse al mundo real!

Sitio Oficial: http://www.disneylatino.com/disneyjunior/

Síguenos en Facebook: http://www.facebook.com/DisneyJuniorLatinoamerica

¡Haz click en el botón SUSCRIBIR y entérate de los nuevos videos de Disney Junior en Youtube!

Aprende a crear mágicos adornos navideños de tus amigos favoritos de Disney Junior. Este globo de nieve es genial. ¿Te animas a hacerlo? Pídele ayuda a un adulto y juntos sigan cada uno de los pasos. ¡Será muy divertido!

Sitio Oficial: http://www.disneylatino.com/disneyjunior/

Síguenos en Facebook: http://www.facebook.com/DisneyJuniorLatinoamerica

¡Haz click en el botón SUSCRIBIR y entérate de los nuevos videos de Disney Junior en Youtube!

El gran cocinero Arnoldo nos cuenta en esta canción la historia de sus padres, acompañado de los Rulos y varios visitantes ilustres, entre ellos Karol Sevilla.

Sitio Oficial: http://www.disneylatino.com/disneyjunior/

Síguenos en Facebook: http://www.facebook.com/DisneyJuniorLatinoamerica

¡Haz click en el botón SUSCRIBIR y entérate de los nuevos videos de Disney Junior en Youtube!

Síguenos en Facebook: http://www.facebook.com/DisneyPrincesa
Sitio Oficial de Disney Princesa: http://www.disneylatino.com/princesas/
Disney Junior Latinoamérica: http://www.disneylatino.com/disneyjunior/
Rapunzel está por cumplir sus 18 años y expresa su más preciado deseo de cumpleaños (de la película: Enredados).

En ENREDADOS, cuando el más buscado -y encantador- bandido del reino, Flynn Rider, se esconde en una misteriosa torre, es tomado de rehén por Rapunzel, una bella y vivaz adolescente con una cabellera dorada de 21 metros de largo que está encerrada allí. Entonces, la singular captora, buscando el pasaporte que la saque del encierro donde ha permanecido durante 18 años, sella un pacto con el guapo ladrón. Así es como el dúo se lanza a una travesía llena de acción con un caballo súper-policía, un camaleón sobreprotector y una ruda pandilla de matones.

¡Haz click en el botón SUSCRIBIR y entérate de los nuevos videos de Disney Junior Latinoamérica en Youtube!

Síguenos en Facebook: http://www.facebook.com/DisneyJuniorLatinoamerica
Sitio Oficial: http://www.disneylatino.com/disneyjunior/
¡Bienvenidos a la Escuela de Herramientas de Manny! Welcome!
Aprende con Manny cómo funciona un nivelador.
¿Cuál es la mejor herramienta para que algo quede derecho? ¡Mira el video!

¡Haz click en el botón SUSCRIBIR y entérate de los nuevos videos de Disney Junior en Youtube!

¡Bingo y Rolly tienen todo el ritmo! ¡Y son tan tiernos! Canta y baila la canción de la serie más traviesa de Disney Junior.

Sitio Oficial: http://www.disneylatino.com/disneyjunior/

Síguenos en Facebook: http://www.facebook.com/DisneyJuniorLatinoamerica

¡Haz click en el botón SUSCRIBIR y entérate de los nuevos videos de Disney Junior en Youtube!

Prepárate para vivir pequeñas historias de estos grandes héroes de Disney Junior. Catboy, Ululette y Gecko resolverán problemas de su ciudad para que todos los vecinos puedan dormir toda la noche. Con sus coloridos trajes viajarán en increíbles vehículos y no descansarán para que todo esté en orden.

Sitio Oficial: http://www.disneylatino.com/disneyjunior/

Síguenos en Facebook: http://www.facebook.com/DisneyJuniorLatinoamerica

¡Haz click en el botón SUSCRIBIR y entérate de los nuevos videos de Disney Junior en Youtube!

Nina está muy apurada, ya no puede aguantar.
¿Quién la podrá ayudar? Una serie para acompañar a los chicos en su crecimiento. Nina tiene que ir! en Disney Junior.

Sitio Oficial: http://www.disneylatino.com/disneyjunior/

Síguenos en Facebook: http://www.facebook.com/DisneyJuniorLatinoamerica

¡Haz click en el botón SUSCRIBIR y entérate de los nuevos videos de Disney Junior en Youtube!

Las chicas hacen un rico pícnic en la selva. Morko y Tulú planean sacarles el pastel pero no todo va a salir como esperan. ¡Vive momentos mágicos con Morko y Mali en Disney Junior!

Sitio Oficial: http://www.disneylatino.com/disneyjunior/

Síguenos en Facebook: http://www.facebook.com/DisneyJuniorLatinoamerica

¡Haz click en el botón SUSCRIBIR y entérate de los nuevos videos de Disney Junior en Youtube!

Vive miles de aventuras junto a Kermit, Piggy, Gonzo, Fozzie, Summer y Animal.
¡Mira Muppet Babies, en Disney Junior!

Sitio Oficial: http://www.disneylatino.com/disneyjunior/

Síguenos en Facebook: http://www.facebook.com/DisneyJuniorLatinoamerica

¡Haz click en el botón SUSCRIBIR y entérate de los nuevos videos de Disney Junior en Youtube!

Subite un ratito al Junior Express.

Sitio Oficial: http://www.disneylatino.com/disneyjunior/

Síguenos en Facebook: http://www.facebook.com/DisneyJuniorLatinoamerica

¡Haz click en el botón SUSCRIBIR y entérate de los nuevos videos de Disney Junior en Youtube!