What is Ecosystem?

Ecosystem refers to the living and

non-living organisms interact

and helping one another to survive.

Predator-prey

Relation ship

positive-negative interaction in that the

predator species benefits, while the prey species is

harmed.

CommensalismParasitism

Mutualism

one organism benefits while the

other is either benefited nor

injured.

give-and-take relationship and both

organisms are benefited

one organism (parasite)

benefited and the other (host) is harmed.

follow just one path of energy as animals find food.

THE SUN provides food for GRASS

The GRASS is eaten by a GRASSHOPPER

The GRASSHOPPER is eaten by a FROG

The FROG is eaten by a SNAKE

The SNAKE is eaten by a HAWK. 

http://www.geography4kids.com/files/land_ecosystem.html http://www.nationalgeographic.com/features/96/forest/inde

x.html http://library.thinkquest.org/11353/ecosystems.htm http://www.nhptv.org/natureworks/

nwepecosystems.htm http://www.globalchange.umich.edu/

globalchange1/current/lectures/kling/ecosystem/ecosystem.html

http://www.vtaide.com/png/foodchains.htm