Golden retrievers: loyal and playful family dogs
Pit bulls: bred for property guards and sadly dog fighting
German Shepard(K-9): good strength, sense of smell, speed, and stamina. Commonly used in the police force.
        
             
        
        
        
The correct answer is B. Oxygen.
Oxygen, as a part of the atmosphere, also participates in UV protection, besides being necessary for breathing.
        
             
        
        
        
Answer:
All organ system(s) are important for proper functioning of the organism but I think Circulatory System is the most important one...!
Explanation:
Because the organism will die without proper blood circulation...!
 
        
             
        
        
        
A. a single chromosome that is not replicated
        
             
        
        
        
Answer:
first one is chromosome and second one is double helix
Explanation:
 idek if that's what your asking lol hope you do good