Their are three main characteristic is intensity, saturation, and hue .
Red color is motivated by power, black is achromatic color with hue  like white gray and white.black is symbol of darkness.  Brightly co-loured object is one that reflects and transmits a large portion of light falling on it. 
The great amount of light is reflected on white screen while a black screen would not reflects any light. Co-lour  also linked with various personality trait , motivation and productivity levels in life. It symbolize life and death , love and evil and happiness and anger.Red color makes you feel passionate and energized.
To learn more about motivation here
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 The notable
hardness of bone is attributed to the presence of inorganic hydroxyapatites.
Due to the calcium salts deposited in it, resulting to the hardness. The
abnormal hardness of bone, which allows it
to resist the compression.
 
        
             
        
        
        
Termites, koalas, field mice, and deer.