6. What is the main
evolutionary innovation
presented by nematodes?
What is the advantage of that
innovation?

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!
The main evolutionary of
nematodes is complete digestive
system, two openings (mouth
anus).

Since the and the defecation
can occur in
extremities of the tube, beings
with complete digestive system
the advantage of new food
while of already eaten are
still inside body and not
eliminated.