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ECOLOGICAL SUCCESSION

Across
What is a simple slow-growing plant that typically forms a low crust-like growth on rocks, trees or walls?
What do you call the process of change in a species structure over time?
What is one of the types of biological and ecological succession of plant life?
What species was the first to colonize previously disrupted or damaged ecosystems?
Down
What is a process started by an event that reduces an already established ecosystem?
What is the final stage of succession, remaining relatively unchanged until destroyed by an event such as fire or human interference.
What do you call a small or limited habitat?
What is the interruption of a settled and peaceful condition?