Answer:
They are Y shaped proteins that work kind of like a laser on a gun in a sense
Explanation:
They latch on to intruders and serve as signals to the immune system to attack the bacteria they have launched on to. After the Bacteria has been destroyed they also stay around and remember what that bacteria looked like so your body can try and stop that type of bacteria sooner and more effectively.
 
        
                    
             
        
        
        
Answer:
Mitochondria and chloroplasts
Explanation:
Mitochondria and chloroplasts each have their own DNA due to at one point being prokaryotes that fused with other prokaryotes. 
 
        
             
        
        
        
Answer:
<u>In the scientific method, theories offer explanations for facts.</u>
Explanation:
Scientific theory is based on complex observation, inference and experimentation techniques. Usually, the resulting reports are checked and peer-reviewed thoroughly before being accepted as explanations for facts evidence. 
Thus, theories are rigorously tested, and verifiable explanations for facts which are based on observations.
 
        
             
        
        
        
Your answer is amino acids