If all of the aphids were killed and removed, what would happen to the number of toads this ecosystem could support?*
a. Increase
b. Decrease
O c. Stay the same
O d. Cannot be determined

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."

every el niño cycle is different. every year.