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Discussion

Monarch butterflies travel long distances to stay warm. They fly up to 3,000 miles to the same winter roosts, sometimes to the exact same trees. However, their life span is only a few months ____________. Their great-great-grandchildren return south the following fall.

  • A.baby swallows and their parents learn each other's voices
  • B.most of the bird species migrate south for the winter
  • C.other butterflies also fly thousands of miles in search of warmth
  • D.so individual monarchs only make the round-trip once

Answer: D

Correct answer: so individual monarchs only make the round-trip once

However, their life span is only a few months sets up a consequence, and the sentence after the blank speaks of their great-great-grandchildren making the return journey. The blank must bridge the two by saying that no single butterfly completes the round trip. The other options change the subject to birds or to other butterflies.

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