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This is a population. A population is a group of the same species that are living together in a certain area.
http://www.cdc.gov/ncidod/dvrd/kidsrabies/images/Forest31.gif

An ecosystem is a community of organisms that live in a particular area. It also has nonliving surroundings.
http://www.sealife.fi/tiedostot/4SaXQC61.jpg

Ecology is the study of how living things interact with the other organisms and the enviorment.
One of the foods that the predator was wanted to eat was salmon and the he trout. One of the predator was a shark,dolphin,and a penguin. The fish who’d get in big groups and act as one.  I didn’t know that the chipmunks and the squirrels could not get together because they have to fight over their nuts. And that the from of conflict may arise when organisms occupy a similar niche.