Exam 3: Ecosystems - What Are They and How Do They Work

Human activities affect the phosphorus cycle by greatly increasing the amount of phosphorus stored in the earth,reducing the amount available for plant growth.

​Producers can also be described as 'self-feeders',or ____.

A sequence of organisms,each of which serves as a source of nutrients or energy for the next,is called a(n)____________________.​

Primary consumers and producers are two examples of ____________________ levels,a way to classify living organisms based on their source of nutrients.

Earthworms,some insects,and vultures are all examples of ____.​

The chemical formula for the nitrogen gas in the atmosphere is ____.​

Geographic Information System (GIS)software allows scientists to ____.​

Most precipitation falling on terrestrial ecosystems becomes ____________________,which ultimately flows into streams,lakes,wetlands,and oceans.

Figure 3.5 -In the accompanying figure of an ecosystem,which components can be categorized as abiotic?

Phosphate can be lost from the phosphorus cycle for long periods of time when ____.​

Ozone,a gas that filters out harmful ultraviolet (UV)radiation,is found in the ____.​

One challenge of laboratory research is that ____.​

Figure 3.10 -What trophic level is occupied by the emperor penguin in the above food web? Briefly state the reason for your choice.

The process by which cells are able to convert glucose into useable energy using oxygen is known as aerobic transpiration.​

​Bacteria and fungi are typically categorized as ____.

Which of the following organisms can be called autotrophs?​

​The most common gas in the atmosphere is ____.

Explain the role that life (excluding the impacts of human activities)plays in the carbon cycle.

Only about 0.024% of the earth's vast water supply is available to humans and other species as liquid freshwater.​

The amount of carbon dioxide in the atmosphere is affected by the carbon cycle.