Roundworms make up the phylum nematoda.
Within the nematoda, a range of reproductive systems occur.
A range of reproductive systems occur in roundworms.
What has a range of sexual reproductive systems?  
(a) Computer systems.
(b) Most plants
(c) animals
(d) Roundworms.
(e) mammals
(f) Art reproductions.
(g) insects
(h) Stuffed toy bears.