The question is incomplete as it does not have the options which are:
- estradiol; pituitary gland
- 
testosterone; hypothalamus
- 
leptin; hypothalamus
- 
leptin; pituitary gland
Answer:
leptin; hypothalamus
Explanation:
Gonadotropin hormones are the peptide hormones released by the nerve cells of the hypothalamus which stimulates the anterior hormone to release the gonadotropins like the LH and FSH hormones.
The GnRH hormone is released when the leptin, a protein hormone secreted by the adipocytes stimulates the GnRH neurons of the hypothalamus to release the hormone in both males and females.
Thus, leptin; hypothalamus is the correct answer.
 
        
             
        
        
        
CORNEA of the eye remains same throughout our life span
        
             
        
        
        
Answer:
um
Explanation:
dond do anything d u m for example if u have to ask someone if this okay to do it moslikley not a goooddecision 
 
        
             
        
        
        
Answer:
Stress has negative effects on physical and mental health.
Explanation:
Stress is present in our everyday life all the time. There is a lot of things that we can stress about during our lives and in every age group, there are many factors that can produce stress. This stress puts us in a bad mood and can take a toll on our mental and physical health. It can wear us out, cause changes like high blood pressure, and can really mess with our mental health. Sometimes stress itself becomes something that we stress about.