Answer:
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A chromatid is one of two identical halves of a replicated chromosome. During cell division, the chromosomes first replicate so that each daughter cell receives a complete set of chromosomes.
Explanation:
I can’t answer how lichens arrive in a barren landscape but I can answer the 2nd part
Lichens grow when exposed to water. When wet, lichens begin to photosynthesize.
The process by which <em>two species evolve</em> as a <em>response</em> to <em>changes in one another over time</em> is called, "coevolution" thus the correct answer is that it is an example of <u><em>COEVOLUTION</em></u>
Yes there is, there is the cycle which trees and plant organisms produce oxygen, and homes animal organisms which can be beneficial to decomposition and other things.
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They both eat, predators eat prey, and prey eat plants.
