Answer:
It is important to have more than one piece of evidence to make sure that the evidence is actually evidence. Or in other words, that the evidence is proven true. With only one piece of evidence, you can't be fully sure if calculations were correct, if the source was trustworthy, etc. 
Multiple evidence is kinda like double checking math problems. If you don't do it, you can't be 100% certain the answer is correct. 
 
        
             
        
        
        
I think A makes the most sense.. 
 
        
             
        
        
        
The right answer is C.
Classically positive interactions or facilitators between species are divided into two broad categories:
- those where the two partners involved benefit from each other: the mutualisms (symbolized by + / +)
- those where one of the two partners makes a profit or an advantage while the other gets nothing from it without being affected negatively: it is the commensalism symbolized by + / 0.
It may be that bacterial commensalism has an interest in its host (the animal) in the sense that it protects against parasites, or on the contrary, it favors their appearance.
 
        
             
        
        
        
The observation from the first question would tend to disprove the idea that evolution is based on b. inheritance of acquired characteristics because according to the experiment  <span>theory of <span>adaptation was taken as a basis.
The answer for the next question is definitely adaptation as at first every live -being should get used to its environment in order to develop and so on.</span></span>
        
             
        
        
        
That right there is a line graph