Explanation:
charles darwin proposed thoery of natural selection.he had collected imnumerable specimens of plant and animals.he published concept survival of fittest. while explaining he says that There is always competition for food.only those organism survive which shows adptations in various reasons. it thoery of natural selection. 
There are some objections, 
1. natural selection is not only factor responsible for evolution. 
2. darwin did not mention uesful and useless modifications. 
3. There is no explanation about slow and abrupt changes 
 
        
             
        
        
        
3.13 x 10 ^9 
This is because only 1 number is front of the decimal and 2 numbers should be after
        
             
        
        
        
Answer:
Virus
Explanation:
Hepatitis C virus, a member of the Hepacivirus C species, is a small, enveloped, positive-sense single-stranded RNA virus of the family Flaviviridae. The hepatitis C virus is the cause of hepatitis C and some cancers such as liver cancer and lymphomas in humans
 
        
                    
             
        
        
        
<span>The process when molecules tend to move from an area of high concentration to an area of low concentration is diffusion! I hope I helped :D</span>