Answer:
Natural Selection
Explanation:
In natural selection process of evolution, traits that are essential for an individual to be fit enough to survive under environmental stress become dominant. 
Since the flowers are of blue or yellow color, it is essential for a bee to be able enough to perceive the blue and yellow color. Hence, the eyes of bee with time have evolved to perceive these two color so that they can pollinate flower. 
 
        
             
        
        
        
What makes studying people difficult is that you are yourself. You will always be different from other humans, so studying them naturally takes you out of your comfort zone
        
             
        
        
        
Answer:
this is rose plant . it's easy . what doubt you have in this question? 
Explanation:
the rose is pink in color. it has green leaves with spikes. generally people give red roses on 14 feb because that day was valentine's day.