Answer:
The correct answer is - 
1. group of many islands - archipelago
2. waterway dug across the land - canal
3. a large body of salt water -  sea
4. land that connects two larger pieces of land- isthmus
5. land totally surrounded by water - island
Explanation:
An archipelago is a group of many islands or scattered chain of islands in the sea. Malay Archipelago is the largest archipelago with 25000 island group in southeast Asia.
The canal is the waterway dug across the land made by humans artificially for the water channels or waterways.
Sea is a large water body that consists of saline water and organism lives in these.
A narrow strip of land that connects two larger lands that are separated by water or similar things called the isthmus.
Island a smaller land surrounded by the water body. 
 
        
             
        
        
        
Explanation:
No matter the shape or size, wetlands provide numerous important services for people, fish and wildlife such as protecting and improving water quality, providing habitats for fish and wildlife, storing floodwaters, maintaining surface water flow during dry periods, and reducing soil erosion. 
 
        
                    
             
        
        
        
D. Cambodia (mostly), Thailand, Vietnam
        
                    
             
        
        
        
Answer:
The only factor that distinguishes different cylindrical map projections from one another is the scale used when spacing the parallel lines on the map. The downsides of cylindrical map projections are that they are severely distorted at the poles.
 
        
             
        
        
        
<u>Answer:
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Europeans wanted to explore for their desire to have more and more gold, spices and to spread the religion.
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Explanation:
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The Spanish and the Portuguese were the most interested in trading with the Asians and the Africans.
- They wished to secure the deposits of gold around the world and become the wealthiest.
- The spices and condiments that made the food tastier were among the main reasons the Europeans set out on exploration rides.
- One of the major purposes of exploration was to spread Christianity to the regions of the world where there was a dominance of other religions and where Christianity was not known.