Use a case study to explain why a coastal habitat has distinct characteristics

One example of a coastal habitat could be a sand dune habitat. The special character for dune habitats lies in the fact that
-they are rarely disturbed by humans
-they are often isolated from each other, which contributes to species diversity

One example is the Portuguese west coast with its rare fern species, some of which don't even have an English name, such as Verbascum litigiosum,

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