They catalyze the chemical reactions. For the molecules at the beginning for the cycle.
Answer: B
Explanation: That'd be based on how it's taken care of
Because the majority of cell differentiation occurs during the EMBRYONIC phase, .................. The embryonic stage of pregnancy is the period after implantation during which all the important organs and structures in the growing fetus is formed. Tetratogens are factors that caused malformation of embryo. Exposure to tetratogens during embryonic stage cause most destructive damages.
