review for tomorrow important!!!!!!!!!

What are the two classes of phylum platyhelminthes? what animal represents each class?

Class Turballeria (Flatworms ) And Cestoda (Tapeworms)

Phylum Cnidaria

Do animals without formal organ systems still need to do the job of those systems?

Yes!!

What is cephalization?

Cephalization = the animal has a head

What symmetry do sponges And cnidarian have?

Sponge: No symmetry

Cnidarians: Radial symmetry

What trait first appeared in Phylum Annelida?

First time that we see a true body cavity (coelom)

What is a coelem? what are its functions?

Ace is the main body cavity in most complex animals. It is surrounded and contains the digestive tract or other Organs.

What kind of circulatory system does an earthworm have?

A closed circulatory system

What is the sea stars nervous system? What To nerves does it have?

Central nerve ring and radian nerve so no brain

What happens if you drop a sea star into two pieces?

Each piece can grow a new sea star. This is called regeneration.

What is the central nervous system composed of in phylum chordata?

Brain and spinal cord