Answer:
3
Explanation:
I hope this is correct and have a great day
 
        
                    
             
        
        
        
Answer:
Both studies support the concept that species operate within a narrow optimum temperature range and are coupled to enzymatic activity.
Explanation:
The studies shown in the question above started from the same concept to establish the scientific experiment and had the same objective related to the investigation as temperature changes in the environment where these organisms live influences the enzymatic activity and, therefore, the functioning of their organism, being able to including modifying the environment around them. In summary, we can say that the studies sought to support the concept that species operate within a narrow range of optimal temperature and are coupled with enzymatic activity.
 
        
             
        
        
        
The answer is D, all of the above.
        
             
        
        
        
First answer is , as the work of ventricle is to push blood to he whole body , so it has to be strong or it can not pump blood to head to the toe !
as in frog (an amphibian ) it has only three chambers as two artia and one ventricle, so the oxygenated blood from left artia and deoxygenated blood from right , combines and thus partial oxygenated blood is circulated !