Day 11 Summary

Mollusk shells are hard due to the presence of the compound calcium carbonate.

• True

• Falses

Typical of all gastropods is a toothed structure which it uses to scrape off and ingest the algae called: 

• 
  

  radula 

   

• proboscis

• veliger

• mantle 

 

The horseshoe crab is not a true crab because 

• 
  

  it lacks antennae and mouthparts

• it lacks a shell 

• it lacks antennae and mouthparts

Krill are not related to copepods. 

• True

• False

Sea stars are predators. 

• ​True 

• False