Unit 3 Study Set

Phylum Platyhelminthes contain which organisms?

• Earthworms

• Flatworms

• Roundworms

• Heartworms

How do Platyhelminthes respire (get oxygen)?

• breathing through lungs

• breathing through gills

• the process of diffusion

• through magic powers

Flatworms have a flat body due to the lack of a...?

• stomach

• heart

• head

• coelom

Flatworms were the first to evolve the mesoderm. What advantage does the mesoderm provide?

• the ability to see

• the ability to hear

• the ability to develop organ systems

• the ability to reproduce

Flatworms have a circulatory and respiratory system.

• True

• False

Many species in Phylum Platyhelminthes are parasitic.

• True

• False

Segmented worms fall under which phylum?

• Nematoda

• Annelida

• Platyhelminthes

The majority of annelids fall into which class?

• Polychaete

• Oligochaete

• Hirudinean

Annelids have the amazing capacity to regrow segments that break off. This is called...

• speciation

• development

• regeneration

• resurrection

What is one key importance of earthworms?

• they eat animals

• they eat plants

• they help maintain soil health

• they help build habitats