The correct answers are 
a. vaginal ring and 
c. oral contraceptives.The vaginal ring is a soft, plastic ring that releases a continuous dose of the hormones oestrogen and progestogen into the bloodstream and prevents pregnancy. Oral contraceptives are also drugs for preventing pregnacy and also contain combinations of the hormones estrogen and progestin )or progestin alone=. Estrogen and progestin inhibit the release of the hormones luteinizing hormone (LH) and follicle stimulating hormone (FSH) which have a role in the ovulation.
 
        
        
        
Answer:
Researchers reported that people with high blood pressure were less reactive when shown photographs and text passages meant to trigger emotions including fear, anger and happiness. This weakened response could be called "emotional dampening," said James McCubbin, a psychology professor at Clemson University in South Carolina, who led the study.
Explanation:
 
        
                    
             
        
        
        
Answer:
Tolerance to heat, light and parasite.
Explanation:
Characteristics of tolerance to heat, light and parasite are the three reasons that might use a higher percentage of Nguni on the sector of livestock farmers in South Africa in 2003. The temperature of South Africa is extremely high which can be tolerated by the Nguni cattle due to its good characteristics. The Nguni cattle can bear extreme temperature, high intensity of light and resistance to parasites make it best suited for that environment.
 
        
             
        
        
        
Answer: organism and reproduce and produce offspring