Exam 17: Ecosystems and Biogeochemical Cycles

The greenhouse gas nitrous oxide,which you may know as laughing gas from your most recent visit to the dentist,has the chemical formula

Nitrates often used for gunpowders,explosives,and fertilizers (when combined with positive ions such as potassium,sodium,and calcium)have the chemical formula

In the diagram below,the dashed horizontal line represents the exponential growth coefficient

Guano is significant because

Storms can compound problems related to hypoxia by

Which of the following is an important role of phosphorus in biology?

An example of commensalism would be

The major reason for the collapse of the Aral Sea ecosystem was the

The areas within the United States where humans have contributed the most sulfur to the atmosphere are generally near

According to the diagram below,the process by which nitrogen moves from the land to the atmosphere primarily after microbes or fossil fuel combustion converts various forms of nitrogen back to N₂,as at the yellow asterisk (*),is known as

What is biogeography? It is a branch of

In the diagram below,the second law of thermodynamics is responsible for the processes depicted by

Which ecosystems would be more tolerant to drought?

Net primary productivity is the

In the diagram below,the population growth rate begins to decline after reaching the inflection point most likely because

The Costa Rican ecosystems described in the introductory section of the chapter on ecosystem and biogeochemical cycles are in a ________ setting that is rich in biodiversity.

If a population of species in an ecosystem does not fluctuate much over time,the ecosystem

Biomagnification can directly cause

In which of the following places on Earth has the local environment's capacity to support its human population been exceeded most seriously?

The diagram below depicts the global