7. What is the group of the
phylum Chordata that first
colonized the terrestrial
environment? From which
habitat did they come?

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!
Amphibians, partially aquatic
terrestrial animals, were first
chordates that the dry land.
came from the
were originated from .
(Nevertheless the first
terrestrial chordates were reptiles).