1. The relationship(s) between organisms within an eco-system.
Symbiosis
The relationship(s) between organisms within an eco-system.

2. Mutualism This is a win-win relationship
Both organisms benefit from each other
 

3. Commensalism This is a win-?? (no one cares) relationship
One organism benefits, the other one doesn’t care – it isn’t helped or harmed.
 

4. Parasitism This is a win-lose relationship
One organism benefits, the other is harmed
 
flea
tick

5. Digger Bee & Palo Verde
Mutualism

6. Gila Woodpecker & Screech Owl
Commensalism

7. Mexican Long-tongued Bat & Palmer Agave
Mutualism

8. Phainopepla & Mistletoe
Mutualism

9. Cowbird & the Oriole
Parasitism

10. Mutualism Wood Rat & Prickly Pear

11. Cactus Wren & Cholla Cactus
Commensalism

12. Hummingbird & Ocotillo
Mutualism

13. Commensalism Saguaro & Palo Verde

14. Desert Tortoise / Prickly Pear
Mutualism

15. Mistletoe and Mesquite
Parasitism
Mistletoe is a parasite. It lives off of another plant. (They like Mesquite trees)

16. Javelina and Mesquite
Mutualism

17. Gila Woodpecker & Saguaro
Commensalism

18. Broomrape & Bursage
Parasitism

19. Yucca & Yucca Moth
Mutualism