Beaches and dunes are an ever-changing environment that have vital roles in the survival of plants and animals.
(Beaches and dunes; are; an ever-changing environment that have vital roles in the survival of plants and animals) (an ever-changing environment; have; vital roles in the survival of plants and animals)
Beaches and dunes an ever-changing environment
are have
an ever-changing environment that have vital roles in the survival of plants and animals
vital roles in the survival of plants and animals