How are primary and secondary succession similar?
a.
both primary and secondary succession involve ecosystems that have no soil.
b.
both primary and secondary succession involve ecosystems recovering from a disruptive event.
c.
both types of succession require a pioneer species to aid recovery of ecosystems.
d.
primary and secondary succession have no similarities.

The correct answer is a

I think the answer is C. Both types of succession require a pioneer species to aid recovery of ecosystems.

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on