The first three are the same as those found in DNA, but in RNA thymine is replaced by uracil as the base complementary to adenine. This base is also a pyrimidine and is very similar to thymine. Uracil is energetically less expensive to produce than thymine, which may account for its use in RNA.
B the warmth from your hands us being transferred
1. proteins
2. essential
3. nonessential
hope this helps!!
There are sometimes similarities in the embryonic stages of organisms that do not exist in the adult stages.
