You are presented with the question "What does the phylum Platyhelminthes usually have?" and the following answer choices: 
- resistance
 - Veins and arteries.
 - Leptospirosis
 - sensory neurons
 - bilateral symmetry
 - parasites
 - food and shelter
 - aerobic capacity

Now knowing that flatworms belong to the phylum Platyhelminthes and flatworms are bilaterally symmetric, choose the best answer.


 

     bilateral symmetry    