Is grass poking through a sidewalk crack primary or secondary succession? Why?

Primary and secondary succession differ because primary is where no soil or organisms exist, but secondary succession is where soil and organisms exist. ... Grass poking through a sidewalk crack would be considered secondary succession because before the sidewalk was built, an ecosystem was there.

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answer: b. nucleolus

explanation: nucleolus is a structure in the nucleus are ribosomes are made.

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