No one organism really needs symmetry. When you think of symmetry though, you usually think of bilateral symmetry. This is when two sides of an organism are almost identical. The sponge just grows whichever way it pleases.
Lateral Symmetry.
Bilateral symmetry
bilateral symmetry
Radial Symmetry
Bilateral Symmetry
turn symmetry
Bilateral symmetry.
Bilateral symmetry. All humans have bilateral symmetry.
Radial symmetry
An octopus has bilateral symmetry.
They exhibit bilateral symmetry.