Life Science Chapter 18

An environmental study reporting on the way temperature, water quality, and minerals affect the animals in a salt marsh would be considering which level of organization?

• ecosystem

• community

• population

• individual organism

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If scientists are studying the egrets, herons, marsh crabs, and cordgrass, but not the water or rocks in a salt marsh, what level of organization would they be studying?

• ecosystem

• community

• population

• individual organism

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What is the lowest level of environmental organization that three male egrets would all belong in together?

• ecosystem

• community

• population

• individual organism

In which type of symbiosis do organisms help each other?

• commensalism

• community

• mutualism

• parasitism

Two members of the same species fight over who gets a certain food. Members of different species try to take over a certain nesting area. These are both examples of

• commensalism

• mutualism

• competition

• community

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Limiting factors determine an area's carrying capacity because

• the number of animals is unlimited

• animals need resources to survive

• ecosystems are small

• the number of animals is limited

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After one species disappears, the other species in the ecosystem

• are unaffected

• die

• are thrown out of balance

• benefit

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In a food web, arrows point in just one direction because they show

• how energy goes to the animal that is eaten

• how energy goes to the animal that is eating

• which animals are related

• which animal is bigger

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A diagram with arrows showing energy flow from grass, to a rabbit, to a fox is

• a population chart

• a food chain

• a food web

• an energy pyramid

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Grass that gains energy from the sun is an example of a

• producer

• decomposer

• parasite

• consumer

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