The study of the lives of early human communities through the examination of their physical remains. Objects made by humans that are unearthed by archaeologists. ... The study of the earth, especially it's rock forms.
 
        
             
        
        
        
reactant gas is carbon dioxide and the product gas is oxygen.
        
             
        
        
        
Answer:
C
Explanation:
The plant is reacting to the sunlight, thus being stimulated.