The American public owns all federal public lands, including National Parks, National Forests, Wilderness areas, wild and scenic rivers, and wildlife preserves. Every American has a personal stake and a guaranteed say in how these places are cared for.
I also do Acellus :)
        
             
        
        
        
Answer:B. 
It was used to prove that smoking causes health problems.
Explanation:
 
        
                    
             
        
        
        
Answer:
The correct answer is- Immune system
Explanation:
There are physical, chemical and immunological barriers present in our body which helps us to protect from the foreign antigen. They all assist each other and helps in pathogen removal from our body.
The physical barrier includes skin, gastrointestinal tract, respiratory tract, etc which do not allow the microbe to enter the body. Chemical barriers include tear, saliva, acid in the stomach which kills microbes on the body surface.
Immune cells like macrophages, B cells kills microbes when it gets in the body. Lymphatic system also contain immune cells and helps in microbe removal.  
So the immune system is assisted by physical barrier, chemical barrier, and lymphatic system.
 
        
             
        
        
        
Growth and development
Reproduction
Maintains homeostasis
Has cells
Metabolism
Heredity
Responds to stimuli
Adapts to environment