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I'm almost positive it's answer c. :)
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Common sources of error include instrumental, environmental, procedural, and human. All of these errors can be either random or systematic depending on how they affect the results. Instrumental error happens when the instruments being used are inaccurate, such as a balance that does not work (SF Fig
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Some examples of primary succession include the formation of a new ecosystem after a volcano, glacier outbursts, or a nuclear explosion. Some examples of secondary succession include succession after a fire, harvesting, logging, or abandonment of land, or the renewal after a disease outbreak.
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I think it might be the last response, since it takes about what some say, 550 million years...
It might be wrong... But take it into consideration that it might be the right answer.
