Succession that ocurs in an area where soil is already present is _________

The first organism that appear in an ecological community

How do lichens contribute to primary succession?

Natural disasters such as fires, hurricanes and tornadoes lead _______________ succession

Unlike primary succession, secondary succession occurs in a place where an ______________ already exists.

Secondary succession usually happens __________ rapidly than primary succession because soil is already present.

Human activities that can discrupt an ecosystem include: (1)_____________, (2)____________ and (3)_____________.

Pioneer species help dissolve rocks into ____________

After lichens help form soil, plants that produce ___________ can establish themselves.

A forest fire is followed by __________ succession.

The series of changes that occur in an area where no soil organism exist is called _________ succession.

After a long time, a __________ community is established and this community does not change unless it is diturbed.