Rooted plants are found only in which zone of a lake?

Which choice below describes a feature of grassland that explains why its remnants are concentrated in arid regions of North America and central Asia?

Which of the following is characteristic of oligotrophic lakes?

After nutrient enrichment from sewage contamination, a lake often becomes inhospitable to fish. Why?

Which of the following pairs of biomes is characterized by relatively simple food webs (low biological diversity)?

Communities that exist in the aphotic zone ultimately depend on food manufactured by chemoautotrophic bacteria or __________.

In which of the following biomes would you expect decomposers to work most rapidly and efficiently?