What are carbon sources

Carbon sources include emissions from burning fossil fuels, forest fires, and respiration. Carbon sinks include the oceans, the plants, and 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."

compost can be added to topsoil as a:

pesticide