Answer:
science is the study of the physical world by observation for the purpose of understanding the world 
 
        
                    
             
        
        
        
The integumentary system (skin) has been called a membrane and an organ but, it is generally considered a system because it has organs that work together as a system. It is sometimes considered an organ because it contains several types of tissues and a membrane and it covers the body.
 
        
                    
             
        
        
        
Its definitely not A or D because there are 26 weeks in 6 months.
generally, a weight loss of 1-2 lbs per week is reasonable and safe. 
I would say B because it is unrealistic that someone would always lose 2lbs a week
        
                    
             
        
        
        
Answer: in the atom you can find: electrons and protons 
Explanation:
You can find electrons in an atom because it is the negative energy that rounds the atom on the outside’s part.
Then, the protons are the positive energy that is on the atom’s inside.
Both of the energies are fused and it end on a neutron energy. 
 
        
                    
             
        
        
        
I think its acid fermentation, but I could be wrong. My class studied this a while ago.