This might be wrong but I think it’s B
        
                    
             
        
        
        
Answer:
<u>Once the myosin-binding sites are exposed, and if sufficient ATP is present, myosin binds to actin to begin cross-bridge cycling. Then the sarcomere shortens and the muscle contracts. In the absence of calcium, this binding does not occur, so the presence of free calcium is an important regulator of muscle contraction.</u>
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Answer:
c
Explanation: this is the correct answer
 
        
                    
             
        
        
        
This is an opinion question, meaning that if you back it up well enough you can't be wrong
Pros to oceans-hydro power
 - cleaner (aka better for the environment)
 - long term sustainability
 - less expensive in the long term
Cons
 - initially more expensive
 - more hydro turbines are required to offset the energy gained from 1 coal    burning plant
 - potentially harmful to (a very limited) marine ecosystem
Just pick a side and back it up.