Discussion
A lichen is a composite organism consisting of
Answer: D
Correct answer: Algae & Fungi
A lichen is a partnership: the fungus provides the structure, anchorage and protection from drying, and the alga (or cyanobacterium) photosynthesises to feed them both. The combination survives on bare rock where neither partner could live alone, and is so sensitive to air pollution that lichens are used as indicators of it.
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