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

Organisms that cannot produce their own food and, therefore, must eat other organisms, are called ____________________.

Organisms that convert simple inorganic compounds into nutrients, without sunlight, are called ____________________ organisms.

Sulfur is added to the atmosphere in all the following ways except

Which of the following is not an abiotic component of an ecosystem?

The study of connections in nature is ____________________.

Agricultural runoffs containing phosphates cause huge blooms of algae in streams and lakes.

Although tropical rain forests are only about 2% of the earth's land surface, they contain at least 50% of the world's land plant and animal species.

Greenhouse gases, including methane, CO₂, and water vapor, make up about 30% of the earth's troposphere.

Vitousek, Rojstaczer, and others estimate humans now use, waste, or destroy what percentage of the earth's total potential NPP?

Which of the following is not a part of the phosphorus cycle?

Nitrogen gas, the major component of the atmosphere, cannot directly be used by plants and animals.

Which of the following is not one of the major processes of the water cycle?

____________________ can help scientists understand large and very complex systems by allowing them to change variables and project possible changes.

Although tropical rain forests are only 2% of the earth's land surface, they contain what percentage of the earth's land plants and animal species?

Precipitation can take several paths when it reaches the earth's surface.Which of the following is not one of those paths?

Which of the following is not a type of consumer?

Only about 14% of the tropical rain forests have been destroyed or disturbed at this point.

The very necessary process of breaking down the dead bodies of organisms is a function of

Use the Figure above to answer the following question(s). -Why is heat shown as being lost to the environment?

An ecosystem is defined as a community of different populations of species interacting with one another and their nonliving environment.