Question

complete the sentence.
seattles woodland park zoo aims to help endangered animal species both by educating visitors and ______________.
breeding animals in captivity
by breeding animals in captivity

Explanation:

To maintain parallel structure in the sentence, the phrase after "and" should match the structure of "by educating visitors". The first option lacks the preposition "by" which is present in the first part of the parallel construction ("by educating..."), while the second option includes "by" to parallel "by educating visitors".

Answer:

by breeding animals in captivity