In your own words, what is the definition for Vitamin (include why they are important to enzymes and what this relationship is called) can someone please help me with this?

thymine. in rna, thymine is replace by uracil

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

the answer is c.) there is a warm front in region a and a stationary front in region b.