I think it would be chlorophyll
 
        
        
        
Answer:
The tissues of multicellular, complex animals are four primary types: epithelial, connective, muscle, and nervous. Recall that tissues are groups of similar cells group of similar cells carrying out related functions.
Explanation:
.
 
        
             
        
        
        
Helps with oxygen and stuff
        
             
        
        
        
Answer:
C. development of vascular tissue for bulk flow
Explanation: