Ecological succession is a

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12.Ecosystem

normal

Ecological succession is a

Long term process

Very fast process

Short term process

Migration

Solution

Ecological succession is directional because succession proced in a direction and periodical. Primary succession is a biotic succession that occurs on a previously sterile or primarily bare area, $e . g .$, newly exposed sea floor igneous rocks, sand dunes, new cooled lava sediment, etc.

Standard 12

Biology