Answer:
When Glucose is in short supply.
Explanation:
Ketone bodies are produced in mitochondria of liver cells to augment the shortage of glucose in the body. Shortage of blood sugar glucose can occur due to fasting, rigorous exercises or medical conditions. 
 
        
                    
             
        
        
        
Hello there.
Question: <span>In seed producing plants pollen grains contain what
Answer: It is vegetative cells.
Hope This Helps You!
Good Luck Studying ^-^</span>
        
             
        
        
        
Answer:
The answer is - It was not a controlled experiment
Explanation:
A control experiment can be defined as that in which the all variable is kept constant and intact and then used as a standard of comparison or measurement to the experimental component.The commercial showing several people initially struggling to balance without the wristband and then balancing fine with the wrist band is not a controlled experiment.
 
        
             
        
        
        
Answer:
B. Not all nonvascular plant bear seeds, but all vascular plants do bear seeds.
Explanation: