Answer:  b
Explanation:
An open system is when nutrients and waste are moved through the body   freely through the body cavity, rather than being enclosed in veins. 
 
        
             
        
        
        
Skeletal muscles are CELLS formed by skeletal muscle tissue, and the tissue is made up of skeletal muscle ORGANS. Hope that helps :)
        
             
        
        
        
Answer:
B
Explanation:
I think so ................
 
        
             
        
        
        
I believe it is B. Thermosphere
 Correct me if wrong.
        
             
        
        
        
I believe the plastics in the oceans are harmful to ocean organisms and human health when people consume ocean organisms. Each plant and animal play its own role in sustaining the world's largest ecosystem. However, due to the ever-growing waste of humanity, we are gradually upsetting this balance. As a global community, we are unable to effectively implement sustainable habits. We produce a lot garbage, and all that garbage has to end up somewhere.