Answer:
Reciprocal altruism is one of the altruism behaviors in which an individual organism helps in increasing the fitness of another organism by reducing the fitness of itself temporarily in expectation of the same behavior from another organism in the future later.
It takes place in the same set of organism partners which is a continuous interaction ion in stable groups of organisms. 
Thus, the correct answer would be - an ongoing interaction in the same set of partners.
 
        
             
        
        
        
Answer:
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Answer: Menopause.
Explanation:
Menopause is the permanent cessation of menstrual cycle which is cause by reduction in follicular activity. This occur in age appropriated women between 48 to 52 upward. Menopause presceed a period where Endocrine, biological and biological features begin to show. Period would like stop in months before Menopause and there may be symptoms of vagina dryness, night sweat and hot flashes.
 
        
             
        
        
        
Answer: 
As humans require a lot of nutritious food for the growth, same way plants also require nutrients in order to grow. Plants which are grown in the soil gets all the required nutrients from the fertilizers and from the land where natural nutrients are stored.
 
        
                    
             
        
        
        
 These cells are called dependent cells