PDF chapter test TRY NOW

Fill in the blanks:
 
skeleton
two
thorax
invertebrate
swan
body
cockroach
breast
breastbone
pneumatic
streamlined
forelimbs
feathers
hind
snail
 
1.  The three parts of the cockroach include the head,and the abdomen.
 
2.  Themuscles are responsible for flight.
 
3.  In birds theare modified as wings.
 
4.  The wings of the birds are equipped withthat play a role in flight.