During exercise stroke volume increases because more blood is sent back to the heart due to the muscles squeezing blood in the veins
 
        
                    
             
        
        
        
Answer: 26.75 meters.
2πr = 84
2 * 3.14 * radius = 84
radius = 84/6.28
r= 13.375 
So the diameter will be 13.375 + 13.375 which is 26.75 meters.
 
        
             
        
        
        
<span>A) Leg of a horse and the leg of a dog.
The rest of the choices are examples of convergent evolution because they are similar in  structures that evolved in separate places in the animal kingdom.
>Bats are mammals and birds are not, yet they both evolved a similar appendage</span><span>
Choices to this question are:
A)
the leg of a horse and the leg of a dog	
B)
the wing of a bat and the wing of a bird	
C)
the fin of a dolphin and the fin of a shark	
D)
the beak of a bird and the beak of a turtle</span>
        
             
        
        
        
Answer:
D. 1000000
Explanation:
Adrenaline signaling occurs when the the hormones clings to the cell surface of the Adrenaline receptor.
The total modified protein target molecules resulting from a single activated signal receptor is 1,000,000 and this results in the consumption of 100 molecules of Guanosine triphosphate (GTP) and 1,010,000 molecules of Adenosine triphosphate (ATP).
Read more on Brainly.com - brainly.com/question/14995672#readmore
 
        
             
        
        
        
Rock B may have many fossils.