In the Evolution of Terrestrial Ecosystems, the Breakdown of Rock

question 39

Multiple Choice

In the evolution of terrestrial ecosystems, the breakdown of rock into soil is an important step that often depends on the appearance of lichens. Which of these statements about lichens is correct?

• A) They represent a fungal/protozoal symbiosis
• B) They are composed of mutually beneficial fungi and red algae
• C) The fungi protect algae from desiccation while the algae provide nutrients
• D) Acids from the algae break down the rock into soil

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