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Invertebrate Characteristics

Eukaryotic, heterotrophic animals that lack a vertebral column and bony skeleton.

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Tubular Squirts
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Tubular Squirts


Pelagic Tunicates

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Extension Investigation

If you need help scratching a mental itch, use the resources below:

  1. What are the common traits between pelagic and sessile tunicates?
  2. How do sessile and pelagic tunicates differ?
  3. Evolutionarily which do you think came first sessile or pelagic tunicates? Explain your answer and give specific reasons for your belief.

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