Fact 1: Flatworms belong to the phylum Platyhelminthes.

Fact 2: Flatworms are bilaterally symmetric.

Given the two facts above, answer the question "What is true about the phylum Platyhelminthes?" with 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      