What are two features all echinoderms have?

Agenotype 'aa' leads to albinism in peacocks. this condition is very rarely found in nature, compared to the normal genotype, 'aa', and 'aa', as theycan be easy prey to their predators and are unable to attract mates. which types of selection forces act here? o a.directional selectionob. stabilizing selectionoc. sexual selectionresetnext© 2019 edmentum. all nights