The galaxy is around the entire solar system
        
             
        
        
        
Answer:
B: sample 4
Explanation:
This is because amino acids are basic units for proteins
 
        
                    
             
        
        
        
The heart’s electrical system is responsible for making and conducting signals that trigger the heart to beat. These signals cause the heart’s muscle to contract. With each contraction, blood is pumped throughout the body. This happens 24/7 without us having to monitor it all the time so that our heart does not stop.
        
             
        
        
        
High temperatures and greater rainfall increase the rate of chemical weathering. 2. Rocks in tropical regions exposed to abundant rainfall and hot temperatures weather much faster than similar rocks residing in cold, dry regions. ... Soils affect the rate in which a rock weathers.
 
        
                    
             
        
        
        
Living things obtain and use energy so alive?