371. In cold-water habitats, certain invertebrates and fish convert starches into complex carbohydrates called glycerols, in effect manufacturing its own antifreeze.

(A) in effect manufacturing its own antifreeze
(B) effectively manufacturing antifreeze of its own
(C) in effect manufacturing their own antifreeze
(D) so that they manufacture their own antifreeze
(E) thus the manufacture of its own antifreeze

Solution:

Pronouns + Wordiness

“invertebrates and fish” are plural. Hence, “it/its” can’t be used for them.
Therefore, A, B, and E are incorrect.
D is wordy. Moreover, “so that” means that “invertebrates and fish” are doing the conversion on purpose as an adaptive tool maybe. But actually, it’s just an effect of the cold climate.
C: “their” correctly refers to “invertebrates and fish”. Clear and concise. Best choice.

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