Which of the following is an example of a trait?
1Goldfinches are yellow with black and white wings.
2Sharks have multiple rows of teeth.
3Marco has brown eyes.
4all of the above

4 all of the above

this is the answer to the question

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."

b. the carbon cycle ensures living things have a source of hydrogen