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Verbal·Standard English Conventions·Boundaries

easy

Physical barriers, chemical defenses, and protein defenses are the three main categories of plant defense mechanisms. The grey alder tree uses a __________ the trees grow protective hairs as a barrier to prevent certain herbivorous insects from feeding on the trees’ leaves.

Which choice completes the text so that it conforms to the conventions of Standard English?

A

physical barrier and

B

physical barrier:

C

physical barrier

D

physical barrier,