If you are building a dichotomous key and you have 10 species to identify, how many couplets should your key have? A) 04
B) 05
C) O9
D) 10

10

Explanation:

easch couplet presents the user with 2 alternatives and exclusive sets of character's.

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.