Life cycles.
D000818:Animals; D056890:Eukaryota / Q000254:growth & development*; D014943:Global Health; D006801:Humans; D009348:Nematoda / Q000254:growth & development*; D009349:Nematode Infections / Q000453:epidemiology / Q000469:parasitology; D011528:Protozoan Infections / Q000453:epidemiology / Q000469:parasitology