I don't really know but I pick b.have always been vestigial.
Answer:
Complementary RNA (cRNA) is a copy of a strand of RNA that will bind to the appropriate region of the original molecule. If the original RNA stand had a base sequence of AUU, for example, the sequence of the cRNA strand would be UAA.
Synthesis of DNA takes place in the S phase
All living things because without chemical reaction life processes will not be complete.
