In endothermic animals, the color of their brown fat tissue is due to the presence of many mitochondria. how does brown fat tissue serve the animal? it

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."

i'd say that the moon rock is about 2.2 billion years old.