12. What is an example of a
hypothesis which may explain
why there is not a big
representation of the class
Reptilia found in polar
regions?

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!
Beings of the Reptilia are
abundant more diverse in
climate regions and are rare in
cold regions like to the
earth . This is explained
these animals are , i.e.,
they have “ blood” and they an
external heat to warm their
.

The heterothermic feature explains
why reptiles more active during
day, a period they can use
sun heat to their bodies.