Agroup of seaside sparrows competing for food, nesting space, and mates in a salt marsh is an example of the level of environmental organization.

The answer is population.

Explanation:

This is the second level of environmental organisation, just above the individual level, which comprises every living organism by itself. The next level concerns the population of a species living in a determined area. In the passage, the example is a group of seaside sparrows.

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the invasive species was introduced due to commercial purpouses, as there was a demand for fur clothes and hence, a business opportunity connected to this product. actually, it was when the nutrias scaped, causing harm to the us ecosystems when they acquired the status of invasive species. in this case they have caused an environmental problem, but it could have affected also economic interests or even human health.