Answer:
A
Explanation:
An isolated system can NOT exchange energy or matter with it's surroundings. This is why it is isolated.
 
        
             
        
        
        
Answer:
because they dont need to consume energy to survive and they have to take control of a host cell to reprouce/replicate, they cant do it on their own
Explanation:
hope this helpedd :)
 
        
             
        
        
        
They help work together because when the heart pmps blood through the body and the cells flow through the blood non stop its like a barrier of protection
        
             
        
        
        
The correct answer is E. He will not readily reveal his feelings.
Reticent can be defined as a person who does not like to talk. 
Reticent has different meaning. For example, It can be termed to somebody who is formal and restrained, Somebody who is not able to draw attention to oneself, and also reticent can also refer to a person who refers to seclusion to others.
 
        
                    
             
        
        
        
<span>For the answer to the question above, I'll just complete the sentence for the answer to your question. "Radial" are characteristics of downcutting streams and a youthful stage of valley evolution.
I hope my answer helped you in someways
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