What Do All Bilaterians Have in Common

Question

What do all bilaterians have in common?
A)symmetrical right and left sides
B)a distinct back and front end
C)a brain instead of ganglia

Accepted Answer

Bilaterians are characterized by having mirror-image symmetry along a sagittal plane and a distinct front and back end. While many bilaterians do have a centralized nervous system with a brain, some have simpler nerve networks known as ganglia. Therefore, having a brain instead of ganglia is not a common trait of all bilaterians.