Roundworms may be free-living or parasitic.
Roundworms nearly all puppies and kittens have roundworms.
Puppies and kittens may have parasitic worms.
What might puppies and kitties have?
a: They have thick fur
b: leeches
c: Animal fur
d: fur and fat
e: sensory neurons
f: parasitic snakes
g: crickets
h: parasitic worms