Herbicides (E

Herbicides (e.g.,"Roundup") inhibit biosynthesis of "essential" amino acids.Which of the following explains why these herbicides,however,relatively safe for animal exposure?

A) They lack the enzymes for photosynthesis.
B) They lack the enzymes for the glyoxylate cycle.
C) They lack the enzymes for the glutamine synthesis pathway .
D) They lack the enzymes for the Phe,Val,Leu,Ile,and His biosynthetic pathways.