On land, which are broad, ecologically uniform areas, are recognized by their characteristic vegetation that reflects adaptation of form and physiology to climate.

biomes                        

Explanation:

Biomes are defined as a distinct ecological and biological communities that are formed in response to the shared physical climate. It is a community or a group of animals and plants which have a common characteristics for the natural habitat or environment they exist in. Biomes has a broader sense than habitat.

It is the area which is best recognized the characteristic vegetation which reflects the adaptation in form as well as physiology to climate.

Hence the answer is ---

biomes  

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