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2. What is the purpose of the interambulacrum, on a regular echinoid?

  • For directing waste away from the mouth
  • The location of the tubercles, for spines
  • For feeding
  • For respiration

3. What phylum doe Graptolites belong in?

  • Hemichordata
  • Mollusca
  • Chordata
  • Echinodermata

4. How do gastropods move?

  • They were planktonic
  • They didn't
  • Using a foot
  • Using spines

5. What is the purpose of the suture line, in cephalopods?

  • To improve buoyancy
  • To protect the body
  • To strenghten the shell
  • To make the shell appealing for mates
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