Answer:
(hope that helps can I pls have brainlist (crown) ☺️) 
Explanation:
Gasomodulators, which include nitric oxide, carbon monoxide, and hydrogen sulphide, are key physiological mediators linked to diseases including neurodegeneration and sepsis. The mitochondria are involved in several of their biological tasks.
 
        
             
        
        
        
1) they have similar chemical properties.
for example fluorine from the 17th column is a non metal so does all the elements of that group.
2)they have same valence electrons in their outermost shell
example
electronic configuration of
 hydrogen 1, lithium 2,1, sodium 2,8,1 and so on.
3) have same valency.
        
             
        
        
        
1.) is runofff ...........
        
                    
             
        
        
        
Your skin has 3 layers. The top layer is called the epidermis. The middle layer is called the dermis. The bottom layer is called the subcutaneous fat.
 
        
                    
             
        
        
        
The correct answer among all of the given choices would be the third choice, CLOUDS.
I hope this is the answer you were looking for and that it helps!! :)