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Practice Listening: Highlight Incorrect Words
ID: #4026
Short
Marine
* Click on the words that are different from what you hear
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Correct Transcript:
The research involved marine snails, but probably applies to all snails, which may expend a third of all their energy producing mucus. So an obvious benefit is that individual snails can save energy that would otherwise go into cutting fresh trails. Snail experts had thought this was the case, but the new study proves it. And it wasn’t easy - the researchers actually measured the fitness of snail trails. A new trail could accommodate a second traveler without additional mucus. But whether trails got thicker, as snails added a bit of mucus where necessary.
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