Production of the mature sperm cells have 4 step process beginning at puberty and throughout the male's lifetime. Spermiogenesis is the final process for production of sperm where the spermatids mature into motile spermatozoa. For humans, the spermatogenesis takes 74 days to 120 days and if the transport on the ductal system is included it would take 3 months.
        
                    
             
        
        
        
I believe that the other person who answers u is right
        
                    
             
        
        
        
Answer: Bears are classified as caniforms, or doglike carnivorans, The lion is a species in the family Felidae
 
        
             
        
        
        
Answer:
The correct answer is direct calorimetry. 
Explanation:
A method of attaining direct determination of the concentration of heat produced by the body inside an insulated chamber, which is sufficiently big to allow moderate amounts of work is termed as direct calorimetry. These chambers within which the measurement is done is also known as the whole-room calorimeters.  
The mentioned process provides the measurement of the energy discharged in the form of heat.  
 
        
             
        
        
        
Explanation:
This is the actions animals/organisms survive.
This is the process animals/organisms adjust to live on any surroundings to survive.
It is the activity/working of animals/organisms.