12. Besides vertebrates two
invertebrate phyla contain
species that make pulmonary
respiration. Which are these
phyla?

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!
Terrestrial molluscs and arachnid
arthropods are invertebrates that
present -like respiration.
Some terrestrial have a mantle
filled with air makes contact
with vascularized tissues that
as rudimentary lungs.
their tracheal respiration
arachnids have book (thin folds
resembling of a book) make
gas exchange.