Keys at the Phylum (Division) Level May Not Be Completely

Keys at the phylum (division) level may not be completely practical because of which of the following?

A) They may require chemical tests that are not easily performed.
B) They nearly always require electron microscopes.
C) They include so many exceptions that they become cumbersome.
D) They mainly consist of simple listings of organisms.
E) None of these answers are correct.

Correct Answer:

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