Answer:
Principles of Geology
Explanation:
J. Henslow gifted Darwin the first volume of Principles of Geology, written by Charles Lyell. The book explains about the old age of the earth. Accordingly, the slow rate of several geological processes suggests that the earth is very old. 
Darwin read the book as the ship was crossing the Atlantic and learned about geological processes occurring over the millions of years. For example, he learned that the earth's surface was not formed by some catastrophic event. 
In his book, Lyell explained the slow and gradual geological processes like erosion gave rise to the vast landscapes present on the earth's surface. 
Darwin compared the time taken by geological processes to form the earth's surface and reasoned if these millions of years were enough to support the evolution of species.
 
        
             
        
        
        
It performs all functions for the organism.
Hope this helps!
 
        
             
        
        
        
Climate change is the choice that answers your statement
        
                    
             
        
        
        
I think it might be prism I’m not sure
        
                    
             
        
        
        
<span>A six carbon sugar is an example of </span>monosaccharide, <span>that can join with other molecule to form a </span>polysaccharide
<span>such as starch or cellulose
</span>