They are heavier because they absorbed the water.
        
             
        
        
        
Answer:
it's A 
Explanation:
it's explaining your idea.
 
        
                    
             
        
        
        
carbohydrate are the largest organic molecules
 
        
             
        
        
        
  However, It would be bright all around. All though the Apollo astronauts that went there, it wasn't as bright as say a desert on Earth but more like an asphalt parking lot.
        
             
        
        
        
I would probably drink a small amount of ocean water in 20 monute intervals, to not over dehydrate myself. This would probably give me enough time to go find other sources of water on the island (eg. coconuts) tp get clean water. In my opinion, this would be a better option than drinking contaminated fresh water. There is a higher risk of getting infected by the bacteria in the water, which would be why its better to take the contaminated fresh water only as a last resort option.
I'm not really sure what I just typed but hopefully it makes some kind of sense to you☺