Fact 1: Roundworms make up the phylum Nematoda.

Fact 2: Roundworms Nearly all puppies and kittens have roundworms.

Given the two facts above, answer the question "What infests nearly all puppies and kittens?" with the following options: 
- insects
 - Nematoda
 - heat or cold
 - water
 - hay fever
 - bacteria
 - parasites
 - the flu


 

  Nematoda       