Fact 1: Flatworms belong to the phylum Platyhelminthes. Fact 2: Flatworms are bilaterally symmetric. Given the two facts above, what does the phylum Platyhelminthes usually have?

OPT:
(1). resistance
(2). Veins and arteries.
(3). Leptospirosis
(4). sensory neurons
(5). bilateral symmetry
(6). parasites
(7). food and shelter
(8). aerobic capacity
Answer:
(5).