Lichens are symbiotic associations that __________.
a. are found in the tissues of plants and may protect them from pathogens or herbivores
b. involve a fungus and a green algae or cyanobacterium
c. require moist environments to grow
d. fix nitrogen for absorption by plant roots
e. enabled plants to move onto land
Answer: b. involve a fungus and a green algae or cyanobacterium
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A. true B. false
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