Exam 20: Communities and Ecosystems

With regard to nutrient pollution in aquatic ecosystems,when is the worst time to apply fertilizer to your lawn?

E.O.Wilson coined the term ________ for our innate appreciation of wild environments and living organisms.

The single greatest threat to biodiversity comes from ________.

In the food chain grass → antelope → human → lion,the human is a ________.

Organisms that consume producers are ________.

Bears eat berries,humans,and large fish; large fish eat smaller fish and insects; humans eat bears,large fish,and berries; Venus flytraps eat insects.The scenario described here is an example of ________.

Why are most food chains limited to three to five trophic levels?

In order to assess the species diversity of a community,you would need to know the number of different species present as well as ________.

The major abiotic reservoir for phosphorus is ________.

What is the estimated annual value of ecosystem services?

The atmosphere is approximately 80% ________ gas.

The primary goal of conservation biology is to ________.