Question

phylum platyhelminthes
platyhelminthes, or flatworms, can live in aquatic and terrestrial environments. they inhabit freshwater habitats like lakes and rivers, as well as marine environments.
the body symmetry of platyhelminthes is defined by bilateral symmetry. one defining feature common to all members of platyhelminthes is the presence of a flat, unsegmented body.
the image below depicts a platyhelminthes with a yellow line splitting it in half which makes it bilaterally symmetric.
what characteristic defines the body symmetry of platyhelminthes?
bilateral symmetry
asymmetrical
radial symmetry

Explanation:

The text clearly states that the body - symmetry of Platyhelminthes is defined by bilateral symmetry.

Answer:

A. Bilateral symmetry