Flatworms belong to the phylum Platyhelminthes, and flatworms are bilaterally symmetric. Given these facts, what is true about the phylum Platyhelminthes among the following options:
- a hemisphere is tilted away from the sun
 - biological diversity
 - they have bilateral symmetry
 - characteristics
 - Something with a head, thorax, and abdomen
 - sub-units of species
 - aerobic capacity
 - The number of individuals


 

   they have bilateral symmetry      