Succession that occurs in an area with no soil is _______________

• ecological succession

• primary succession

• secondary succession

• pioneer species

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

• ecological succession

• primary succession

• secondary succession

• pioneer species

The first organism that appear in an ecological community

• ecological succession

• primary succesion

• secondary succession

• pioneer species

How do lichens contribute to primary succession?

• Lichens decompose organic matter from animals and plants

• Lichens begin to break down rock to form soil

• Lichens are nitrogen fixing bacteria

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

• secondary

• primary

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

• ecosystem

• sport teams

• climax community

• pioneer species

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

• more

• less

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

• mining, sleeping, walking

• mining, forming, logging

• logging, online gaming, eating

Pioneer species help dissolve rocks into ____________

• bigger rocks

• much bigger rocks

• really big rocks

• soil

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

• fruit

• gravel

• seeds