Which example best illustrates the process of natural selection?

a
Giraffe necks varied in length and all offspring had an equal chance of survival.
b
Giraffe necks varied in length and the shorter neck giraffes were at a disadvantage.
c
Giraffes with the short necks migrated to locations best suited for their neck lengths.
d
Giraffes stretched their necks to reach food, and resulting offspring had longer necks.

d

Explanation: giraffe strenched their necks to reach food and resulted into their offspring having longer necks

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."

one would be wind another would be water density