Discussion
The lichen and moss stages occur in
Answer: A
The lichen and moss stages occur in a lithosere.
A lithosere is a succession that starts on bare rock. Crustose lichens are the pioneers, which are followed by moss, then herbs, shrubs and trees.
A psammosere starts on sand, and a hydrosere starts in water, where its early stages are plankton and submerged plants. Hydrarch is the general term for succession beginning in water, so it does not name the rock succession.
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