Answer:
d. contains secretions from three different accessory glands
Explanation:
The semen is not only made up of sperm. It also consists of secretions coming from three accessory glands: <u>seminal vesicles, prostate gland and bulbourethral gland.</u> 
The seminal vesicles secrete<em> proteins, citric acid, sugar, etc</em>. and this accounts for<u><em> 2/3 volume of the semen</em></u>. It has a white color that has a tinge of brown. 
The prostate glad, on the other hand, secretes a fluid that accounts for <u><em>1/3 volume of the semen.</em></u> This contains the Prostate Specific Antigen (PSA) that thins the semen. 
The bulbourethral gland is also known as<em> "Cowper's gland." </em>This produces a secretion that ensures the sperm's motility.
 
        
             
        
        
        
Find a new hobby to start and maybe do a self transformation and create a new image of yourself. Try to always think of the positive things in your life
        
                    
             
        
        
        
“Scientific models are often used in laboratories to represent Earth's processes. While field tests and observations are vital, physical, digital, and mathematical models are useful tools in the laboratory. Models provide insight into complex processes that might otherwise be difficult to grasp”
 
        
             
        
        
        
The energy needed to raise the temperature of 1 kilogram of water through 1 °C, equal to one thousand small calories and often used to measure the energy value of foods