Answer:
D. Both a and c are correct.
Explanation:
The tragedy of the commons is a situation in a shared-resource system where individual users, acting independently according to their own self-interest, behave contrary to the common good of all users by depleting or spoiling the shared resource through their collective action.
It damages our environment (plants, animals) and impacts local tourism. It is smelly and dirty, and carries germs, bacteria and viruses. Places with a high degree of littering see a decreases in property values, and are more likely to be the site of fires. 
Pollution is a negative externality. Economists illustrate the social costs of production with a demand and supply diagram. The social costs include the private costs of production incurred by the company and the external costs of pollution that are passed on to society.
Blowing litter can cause automobile accidents as well as land and air pollutions
 
        
             
        
        
        
Yes because places that are poor can’t pay for as many treatments as others
        
             
        
        
        
Answer:
the central nervous system, cardiovascular, respiratory, and musculoskeletal systems
Explanation:
 
        
                    
             
        
        
        
Under natural conditions, most populations will stabilize at a level known as the carrying capacity of the ecosystem<span>. The carrying capacity is the maximum </span>number of organisms that an ecosystem can support<span> on a continued basis.</span>
        
                    
             
        
        
        
The answer is continental rise that is what I found!!!!! I hope this helps!!!!!!