Answer:
A. Integumentary system 
Explanation:
The integumentary system consists of the skin,hair and nail. This system consists of the largest organ in the body. The skin helps in protection against pathogens by shielding the internal body system from external objects.
The skin also helps in Vitamin D production through sunlight.
It also helps to prevent dehydration through regulation of water loss.
 
        
             
        
        
        
The correct answer is 100%
This is because Back and white are both incomplete dominant traits. When you cross these together, all (100%) of the offspring will be heterozygous blue.
I just took the test on USATestPrep, so I guarantee you that is correct!
Have a great day! :)
 
        
             
        
        
        
You can classify them in what phase they are in: solid, liquid, gas
You can classify them in Sizes
You can classify them by the number of moons they have
You can classify them by distance from the sun
You can classify them all as heliocentric or orbiting/circling around the sun
You can classify them by color
        
             
        
        
        
A)  
learn about the universe and the laws of nature.  
B)  
design new scientific instruments.  
C)  
make new inventions and processes to benefit humans.  
D)  
make new scientific discoveries.
I believe the correct answer is C, but I'm 100% on this.  Hope this helped though!