True or False:
They are less elaborate organisms than cnidarians.
: more elaborate
Wall is much thicker; many more cells; nerve net
grey material in picture
-- it is branched to allow access
increase surface area= complexity of body needs branching for total access of body
Why do they have a branched cardiovascular system?
to give access for all parts of body
Mouth is on undersurface; from the mouth it can extend the pharynx (from the mouth)
Explain the cells that line the gastrovascular cavity.
can release digestive enzymes on to prey OUTSIDE of the body
Explain extracellular digestion.
partially digests the prey
sucks up the pieces and the pieces are taken in by
to the cells of the
cavity where digestion is completed