What is ecological succession?

What is one difference in primary and secondary succession?

• a) secondary succession begins with lichens and primary succession begins with trees. b) primary succession is low and secondary succession is rapid c) secondary succession begins on previously populated soil and primary succession begins on newly exposed surfaces d) primary succession modifies the environment and secondary succession does not so yes this is for homework. get over it. i need to know it so im asking. spare me the lecture on cheating. thanks.

• Answer:

  c) secondary succession begins on previously populated soil and primary succession begins on newly exposed surfaces.