List 4 facts of primary succession & 4 facts of secondary succession .

-The stages of primary succession include pioneer plants (lichens and mosses), grassy stage, smaller shrubs, and trees.

-Animals begin to return when there is food there for them to eat.

- Successional dynamics following severe disturbance or removal of a pre-existing community are called secondary succession.

-An area of growth.

-A disturbance, such as a fire, starts.

-The fire destroys the vegetation.

-The fire leaves behind empty, but not destroyed soil.-

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."