Roundworms make up the phylum Nematoda, and within the Nematoda, a range of reproductive systems occur. Given these facts, what has a range of sexual reproductive systems?   among the following options:
- Computer systems.
 - Most plants
 - animals
 - Roundworms.
 - mammals
 - Art reproductions.
 - insects
 - Stuffed toy bears.


 

    Roundworms.     