* Flatworms (Platyhelminthes): This group includes tapeworms and flukes, which are hermaphrodites (possessing both male and female reproductive organs). They often reproduce sexually through internal fertilization.
* Roundworms (Nematoda): Roundworms like hookworms and pinworms are dioecious, meaning they have separate male and female individuals. They reproduce sexually through internal fertilization.
* Segmented worms (Annelida): This group includes earthworms and leeches. They are typically dioecious, with separate male and female individuals. They reproduce sexually through external fertilization, where the female lays eggs and the male fertilizes them.
* Ribbon worms (Nemertea): Most ribbon worms are dioecious and reproduce sexually through external fertilization. Some species are hermaphroditic.
* Velvet worms (Onychophora): These are dioecious and reproduce sexually through internal fertilization.
Important Note: While most worms reproduce sexually, there are exceptions. Some species, like some flatworms and roundworms, can reproduce asexually through processes like fission or parthenogenesis (development of an egg without fertilization).
