The answer would be B. External Fertilization because the combination of Sperm and Egg happen outside or externally.
0.12 I think it is aw aw aw aw
It is either carcinogens or viruses (I think the first) I hope this helps!
Answer and explanation;
-Aba is a suitable replacement because Aba and Cys have approximately the same sized side chain and are similarly hydrophobic.
-However, Aba cannot form disulfide bonds so it will not be a suitable replacement if these are required.
-Alpha-Aminobutyric acid is biosynthesized by transaminating oxobutyrate, a metabolite in isoleucine biosynthesis.