Why dies???? what do you mean
        
             
        
        
        
.dont taste or sniff chemical 
 Tasting and smelling some chemicals can be dangerous and even deadly.the best way to know what is in a container is to label
. Don't play mad scientists 
 This result in mixing chemcals to see what happens the result could be explosion ,fires,or releasing toxic chemicals
.Dress for the lab
 This is a safety rule because clothing is one of your best form of protection against an accident wear covered shoes,long pants,and keep your hair tied so it cant fall into your experiment 
 
        
             
        
        
        
The answer is an envelope.
A virus is an infectious agent that can replicate only inside a host cell. When it is outside the cell, it consists of genetic material coated with protein capsid. Some viruses also have an envelope which covers capsid. The function of the envelope is to identify and bind some receptor sites on the host membranes. After fusing with the cell membrane, it allows to capsid and genetic material to enter the cell and infect it.
        
                    
             
        
        
        
E. beef liver 
none of these foods have cholesterol, in fact avocado can help lower cholesterol.
        
             
        
        
        
Answer:
bucket ( the more far from sunlight the least amount of oxygen will produce)
Explanation:
the more far away from sunlight, it will produce least amount of oxygen