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This is an example of

Which substances usually stimulate an immune response?

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Which statement best explains the resistance of garter snakes to the newt toxin?

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The specialized function of this cell is most dependent on

Maintaining stability in an ecosystem most likely depends on

Photosynthesis and cellular respiration both involve the gases carbon dioxide and oxygen. Which statement best identifies how these gases are involved in the two processes?

Antibodies produced against one pathogen infecting the human body may not work against a different pathogen because antibodies are

A multicellular organism has cells that perform various roles in that organism. This is most likely due to the

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The changes in the guard cells' activity illustrate

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This similarity between whales and alligators supports the idea that

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