Soil degradation is primarily attributed to:
A. wildfires, surplus soil organisms and dense vegetation.
B. poor agricultural practices, overgrazing and deforestation.
C. erosion, excessive tillage and coastal location.
D. exhaustion of parent material, severe climate and leaching.
E. heavy rainfall, agroforestry and crop rotation.

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."

"it built up in the atmosphere"

i think thats it, idk, i tried looking for this exact q& a for grad. and idk if i got this question right or sorry if im wrong