Answer:
Have a distinct head a end.
Step-by-step explanation:
Bilateral symmetry is an imaginary line that divides the body of the animals into two equal (or nearly equal) halves, passing exactly through the center of the animal dividing them into only one plane of symmetry (left and right).
This is one of the most used characteristics to classify and describe living beings. Bilateral symmetry is present in chordates, arthropods and mollusks.