Simplify the following text for a Grade 10 native English-speaking person.
Original: They are generally classified as a single species , Trichoplax adhaerens , although there is enough genetic diversity that it is likely that there are multiple , morphologically similar species .
Simplified: The Placozoa has only one species , Trichoplax adhaerens . There is enough genetic diversity that it is possible that there are multiple , morphologically similar species .