Adult echinoderms have radial symmetry, and echinoderms are spiny skinned animals found only in marine environments. Given these facts, adult spiny skinned animals found only in marine environments have what among the following options:
- sensory neurons
 - to stay warm
 - Animal survival
 - extra brains
 - aerobic capacity
 - eight eyes
 - asymmetrical axis
 - radial symmetry


 

        radial symmetry 