Which of Earth's unique features is the most significant, and without which, the other significant features that support life would have had no effect?
A. angle of axial tilt
B. distance from the Sun
C. presence of an atmosphere
D. presence of water on the surface
E. presence of a solid, rocky surface

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."

age range would be the answer

"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