9. How can the features of the
arthropod exoskeleton explain
the terrestrial adaptation of
some species of the phylum?

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!
In the arthropod there is a
of wax which impermeable. This
feature fundamental for primitive
from the sea survive on
dry without losing excessive
to the environment.