18. Platyhelminth identity
card. How are platyhelminthes
characterized according to
examples of representing
beings, basic morphology,
type of symmetry, germ layers
and coelom, digestive system,
respiratory system, circulatory
system, excretory system,
nervous system and types of
reproduction?

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
Examples of representing :
planarias, schistosomes, taenias.
morphology: flat worm. of
symmetry: bilateral. layers and
coelom: , acoelomates.
Digestive system: .
Respiratory system: nonexistent,
by diffusion. Circulatory
: nonexistent. Excretory system:
with flame cells.
system: ganglial, beginning
cephalization. Types of :
asexual and sexual.