Arthropods and Echinoderms Anatomy

Why do arthropods have to shed their exoskeletons?

• it wears out
• they don't shed
• it limits the size they can grow
• to go from water to land environments

What does the term arthropod mean?

• soft
• little rings
• jointed foot
• cephalization

?

• Crustacea
• Arachnida
• Insecta
• Myriapoda

?

• Arachnida
• Insecta
• Crustacea
• Myriapoda

All arthropods have segmented bodies, jointed appendages, and ________________. 

• tails
• lungs
• wings
• an exoskelton

Starfish only reproduce sexually.

• True
• False

Echinoderms

• are radially symmetrical as larvae and as adults.
• have an exoskeleton as adults.
• are bilaterally symmetrical as larvae and radially symmetrical as adults.
• are radially symmetrical as larvae and bilaterally symmetrical as adults.

Echinodermata means

• spiny skin
• five limbs
• skin gills
• tentacles surrounding mouth

What echinoderm is this?

• sea lily 
• sea urchin 
• sea cucumber 
• sand dollar 

What echinoderm is this? 

• sand dollar
• sea urchin 
• sea star
• brittle star