Decomposer, they eat dead organic material
        
                    
             
        
        
        
Explanation:
Yes they can. An AB parent can indeed sometimes have an O child. But it is by no means common. In fact it would be fair to say that it is exceedingly rare.
The one exception is in certain Asian groups. Some of these folks have a rare version of the ABO blood type gene called cis-AB. People with this gene version have an AB blood type but can easily have an O child.
 
        
                    
             
        
        
        
Answer: Most likely 1 or 4
Explanation:
 
        
                    
             
        
        
        
ACTH (Adrenocorticotrophic hormone) stimulates the adrenal glands to secrete its hormones.
hGH (Human growth hormone) also known as somatotrophic hormone is responsible for the growth of long bones, muscles and viscera.
TSH (Thyroid stimulating hormone) influences the structure of the thyroid and causes it to secrete thyroid hormone.
 
        
             
        
        
        
Answer:
combustible        ....................