D. because if they're not careful they become extinct by predators, then they have to be careful to survive by staying alert.
 Please help.
 
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An ocean habitat is a large body of salty sea water. There are rocks, sand, mud, and seaweed, where some animals make homes or hide from predators.
        
                    
             
        
        
        
Answer:
Information that are required to classify an organism are given below. 
1. Unicellular or multicellular : First we have to see that from how many cells the body of organisms formed.
2. Composition of cell wall: Secondly we have to see the cell wall composition.
3. Prokaryotic or eukaryotic cell: We have to see the nucleus of organisms, if it has nucleus we can say that it is a eukaryotic cell.
4. Mode of nutrition: Mode of nutrition means is the organisms is autotroph or heterotroph.
If they have similarities, so it is placed in one group. If not so it is placed in different group or kingdom.
 
        
             
        
        
        
Answer:
Explanation:
They need salt in the water to the tune of 35 grams / kg. If they are thrust into fresh water with virtually no salt, they do not get the natural osmosis process taking place.  They will bloat and die.
Interesting question. Nature has a strange way of making things right. Those salt water shrimps can't over run the fresh water ones, for the reason given above. 
 
        
             
        
        
        
Answer:
its gives us oxygen witch most thing take to stay alive