Answer:
D.) Stimulus is the correct answer.
 
        
             
        
        
        
C Fossils allow scientists to have an idea of the time scale that traits evolved.
        
                    
             
        
        
        
Some species we see in Alaska and nowhere else in the Wolrd are:
Bats
Shrews
Bears
Seals
White Wolfs
Sea lions
Racoons
Walrus. 
Bears, Seals, White Wolfs and Sea lions survive the cold weather much more than those other animals. 
 
        
        
        
"Photosynthesis", this means plants breath in carbon dioxide and breath out Oxygen
        
             
        
        
        
The rock formations formed left behind where sedimentary rocks.