Final answer:
The correct answer to the question regarding the enzymes that degrade mRNA from the ends in P-bodies is mRNA exonucleases. They remove nucleotides from mRNA after protective caps are removed or lost.
Step-by-step explanation:
The enzymes involved in chopping up mRNA and serving as degradative components of P-bodies, which cut up mRNAs they're attached to from the ends, are known as mRNA exonucleases. These enzymes methodically remove nucleotides from the ends of an mRNA molecule. In the context of mRNA stability and degradation, mRNA exonucleases degrade unprotected RNAs by removing nucleotides from the 5' or 3' ends, following the removal or loss of the protective elements such as the 5' methylguanosine cap or the poly-A tail.