In which reaction is there a transformation of mass into energy? A. Calcium oxide combines with water to form calcium hydroxide.
B. Two hydrogen atoms fuse to form a helium atom.
C. Ammonium nitrate breaks down into dinitrogen monoxide and
water.
D. Sodium combines with chlorine to form sodium chloride.

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."

the farther away the object is from the central star (the sun) it's gravitainal pull on the object is weaker when it is farther

explanation:

i believe the answer would be b. hope it : )