Some are one sex part of the time and the other sex part of time. Some have
reproductive organs that are far enough removed from each other that self fertilization is difficult. Others that release ova and/or sperm along with many other individuals and fertilization is random. These are just examples there are probably many more variations.
A leech is also an annelidia, such as the earthworm.
An earthworm does not have a liver, it also does not have a gallbladder.
subterranean
The earthworm did not evolve,rather it was created as a worm. It did not come from another species,all of it's ancestors were worms.
There is a species of earthworm that has 8 heart chambers.
A hermaphrodite is a single animal possessing both male and female reproductive systems. A typical example would be the earthworm. They are both male and female, exchanging sperm during coupling.
Earthworm does not have the back bone. Earthworm is invertebrate animal.
Earthworm does not have the back bone. Earthworm is invertebrate animal.
A leech is also an annelidia, such as the earthworm.
An earthworm.
Starfish can be male, female, or hermaphrodite. A hermaphrodite is a plant or animal that has reproductive organs of both sexes.
protogynous - a hermaphrodite flower or animal
A hermaphrodite.
Snails. Search: HERMAPHRODITE
An earthworm does not have a liver, it also does not have a gallbladder.
Earthworm.
Earthworm