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2. What is a gill?

  • Feathery structure used for gas exchange that is positioned above the legs.
  • For locomotion
  • Part of the cephalon that breaks away from the skeleton during ecdysis.

3. What phylum are Trilobites part of?

  • Echinodermata
  • Cnidaria
  • Arthropoda
  • Brachiopoda

4. What is the term for the process where a trilobite sheds its exoskeleton?

  • Ecdysis
  • Bleaching
  • Secretion
  • Siphon

5. What is the name of tough substance that makes up a trilobites hard exoskeleton?

  • Glabella
  • Pleuron
  • Chitin
  • Pygidium
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