Use the diagram below to explain the difference between primary and secondary succession and give an example for each one

Primary succession occurs following an opening of a pristine habitat. Secondary succession is a response to a disturbance.

before it leaves the nucleus of a eukaryotic cell, mrna is altered in the following ways: - a cap is added to the 5' end of the mrna molecule; - a poly a tail is added to the 3' end; - introns are removed and exons are spliced together.

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