If a repressor protein attaches to the operator, RNA polymerase cannot proceed to transcribe key enzymes needed by the organism. This can be seen in the trp operon in E .coli bacteria.
 
        
             
        
        
        
Answer:
A tsunami <u>reduces the carrying capacity</u> of the coastal environment. 
It damages the ecosystem by reducing the available resources such as food or shelter, and consequently decreases the number of individuals.
Explanation:  
Due to technical problems, you will find the complete answer and explanation to this question, in the attached files.
 
        
             
        
        
        
Answer:
Think about it. Worms move with MUSCLES. So the first answer is None.
The appendage of a roundworm is not present.
How do you think worms turn and move? They are segmented. The symmetry  of a worm is Bilateral.
Explanation:
I'm doing the assignment myself. Look up the answers and use common logic. 
 
        
             
        
        
        
D Bc I just did it and got it right