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What is the difference between primary and secondary succession?

Answer 1

Lydia Adams

Primary succession is on pristine habitats, while secondary on disturbances.

The primary succession occurs following an opening of a pristine habitat, e.g., on lava flow, an area left from retreated glacier, or abandoned mine.
The secondary succession is a response to a disturbance e.g., forest fire, tsunami, flood, etc.

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Answer 2

Eli Ayoub

Primary succession occurs in an area where no ecosystem existed before, such as on newly formed land. Secondary succession occurs in an area where an ecosystem has been disturbed or destroyed, but the soil remains intact.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.