Answer:
symbiotic
Explanation:
symbiotic relationships benefit both organisms 
 
        
             
        
        
        
Answer:
a. Mammalia
Explanation:
Mammalia are the class species that have distinct systems and separate ducts for different activities like reproduction, excretory, and defecatory and moreover they have nipples to feed their young ones. 
So, the above species which has a single duct for reproductive, excretory, and defecatory material as well as a lack of true nipples does not belong to Mammalia
 
        
             
        
        
        
A: Glyclosis 
This is just a guess as I need to answer at least one question
        
             
        
        
        
Answer:
effector
Explanation:If the value is not at the set point or is outside the normal range, the control center sends a signal to the effector. The effector is an organ, gland, muscle, or other structure that acts on the signal from the control center to move the variable back toward the set point.