Answer:
divots or holes
Explanation:
they hit at a high speed and make a divot in the ground
 
        
             
        
        
        
Answer:
B. Nuclear energy 
this type of energy splits nuclei or combines them. 
 
        
                    
             
        
        
        
Answer:
7 days.
Explanation:
In 7 days the moon will be in its last quarter phase. In the last quarter phase, the half part of the moon is illuminated and the other half is hide in darkness. The illumination of the sides of the moon provide information about the dates of the month. Last quarter phase is also called third phase of the moon. In this phase, the Moon is in quadrature and has the elongation of 270 degree. It is also the indication that the half cycle of the moon is completed and the other half is started.
 
        
             
        
        
        
The answer is pheromones. Hope that helps :)
        
             
        
        
        
Answer:
option D
Explanation:
Negative feedback is a mechanism in which function of a cell or an organ is decreased. It lessened the output of a system and maintain system function which is known as homeostasis. It is a regulatory mechanism of normal physiology. Some of examples are 
blood sugar level regulation, regulation of blood pressure, thermoregulation and many more.