Answer:
Increases (dont mind this it's to get past the letter minimum)
Explanation:
Your answer is increases
 
        
             
        
        
        
Answer:
D. Columnar 
Explanation:
Hint the root word is in the option and it is actually shaped like a column according to Epithelium - Wikipedia
Hope this helps : )
 
        
             
        
        
        
I believe filtration is the first step in treating lake water. 
Hope this helps!!