I am all of the living and nonliving things in a certain area. What am I?

I am what organisims must go through to obtain a reasoure that is available in a limited supply. What am I?

I am the relationship between two kinds of organisims that lasts over time. What am I?

I am any nonliving part of an ecosystem. What am I?

I am the role that a speices has in a community. What am I?

I am any living thing in an ecosystem. What am I?

I am all of the populations in a certain area. What am I?

I am all of the organisms of the same kind that live in a particular area. What am I?