Answer: Primary and secondary succession
Explanation: In primary succession, newly exposed or newly formed rock is colonized by living things for the first time. In secondary succession, an area previously occupied by living things is disturbed—disrupted—then recolonized following the disturbance.
Pili connects a bacterium to another of its species, or to another bacterium of a different species. That builds a bridge between the interior cells.This enables the transfer of plasmids between the bacteria