I think tissue or a nucleus 
        
                    
             
        
        
        
Temperate Diciduous forest Biome
        
             
        
        
        
Answer: c. The myosin would not be able to let go of the actin 
Explanation:
Muscles consists of two proteins called actin and myosin and responsible for muscle contraction.
Myosin is ATP dependant and when ATP binds to it, it is able to release the actin.
This will allow the actin and myosin to seperate from each other thus leading to muscle contraction 
 
        
             
        
        
        
Darwin concluded that the sea level was high were it reached the mountain and as times passed sea level lowers down and clams were still on the mountain so when they died they were fossilized in the mountains. Hope this helps