DNA replication occurs in the synthesis stage and is followed by the gap 2 stage
Answer:
Free nitrogen is simply molecular nitrogen (N2). Nitrogen, in its molecular form, consists of two nitrogen atoms bound together with a tripple bond. ... So basically, any nitrogen that is in an organic compound is considered “fixed” nitrogen and N2 is considered to be “free” nitrogen
Explanation:
It is d, a substance that participates in a chemical reaction. You can also tell it just by looking at the stem of the term :)
More than likely IgM.
(Then followed by IgA and IgE antibodies)
