Answer:
A coral reef is a reef-shaped structure in the sea, formed by anemones and which over time becomes large enough to have a significant ecological and physical impact on its environment. These are the largest structures built from living organisms in the world.  Coral reefs are complex marine ecosystems. They are a biotope (area of life) of a biocenosis (community of living beings) consisting of plants and animals, for example worms, shellfish, sponges, thorns and crustaceans. Coral reefs play a significant role as “breeding grounds” for the offspring of fish inhabiting the high seas.
 
        
             
        
        
        
Based on the contour intervals given, the feature that is most likely seen in these topographical maps is A. Streams. 
<h3>What feature is on the topographical map?</h3>
Streams generally flow in over gentle elevations which means that the contour intervals are generally spread out and are 50 m or less. 
The contour interval here is 50m which means that the most likely feature would be a stream. 
Find out more on topographical maps at brainly.com/question/1026002.
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The desert regions in China that are largely uninhabited are the Iner Mongolia region on the north of the country, and the Xinjiang region on the west of the country.
Saudi Arabia is a country that in most part is uninhibited and people are concentrated  in the cities which are surrounded by desert and some partially from sea. The most uninhabited regions are Northern Borders, Jawf, Bahah and Najran.
        
             
        
        
        
The thing that makes coastal plains unique is that they are flat, low-lying pieces of land next to the ocean.