Question

one of the characteristics of phylum cnidaria is that the species in this phylum have
adial symmetry.\ which of these is the best description of
adial symmetry\? are symmetrical on any plane in a circular form can swim very fast to escape predators

Explanation:

Radial symmetry means an organism can be divided into similar parts around a central axis, like cutting a pie. It's about body - form symmetry, not swimming ability.

Answer:

are symmetrical on any plane in a circular form