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Thinking Scientifically
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  1. Roundworms are tubular and have a complete digestive tract. What advantages can you associate with these anatomical features which might account for roundworms being more plentiful than flatworms.
    Answer
  2. You are taking a lab practical that covers just the phyla in this chapter. What criteria would you use to classify an unknown animal in one of these phyla?
    Answer





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