Which process is an example of a physical change

A

Explanation: it would be A because carrots being cut into pieces and bing mixed into a salad isn’t changing the carrot into something else, it’s just changing the appearance of the carrot and putting it in a salad.

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."

answer: - b cells

explanation: -

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.