Which statement is the best description of an ecosystem?

A large geographic area dominated by specific types of plants and animals and characterized by a distinct climate is called __________.

Which biome covers the largest part of earth?

Which of the following most accurately demonstrates the order of energy flow in an ecosystem?

Early one spring, a group of bird-watchers counted 30 different species of birds in a tract of forest. In the early spring two years later, the bird-watchers counted 15 species in the same area. Which statement best summarizes this situation?

Which types of organisms recycle the organic molecules of dead organisms at all trophic levels and return their nutrients to the environment?

Which statement best describes the term biodiversity?

Which statement best summarizes the water cycle?

Which trophic level contains the organisms that are the source of all chemical energy used in an ecosystem?

Which statement best describes how organisms use nitrogen?

What is the largest reservoir of nitrogen?

All penguins living together in one area are called a __________.

During the summer in the Arctic, mosquitoes breed exponentially. When winter comes, the population decreases dramatically due to a limiting factor. What is most likely the limiting factor in this situation?

Which phrase best describes a community?

What is an abiotic factor in a tropical rain forest?

Which of the following can be considered an ecosystem?

Which of the following consequences occurred when sea otters were overhunted along the Pacific Coast?

To identify a biome, which types of information would be most helpful?

Which statement is true about biomes?

Ten square miles of temperate forest has a larger variety of organisms than 10 square miles of taiga. What does the temperate forest have more of?

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