It rains, water moves and erodes the land and creates valleys and rivers.
        
             
        
        
        
It is false scientist don't need to repeat an experiment
        
             
        
        
        
Answer:
A. An area with low air pressure
Explanation:
The red "L" symbol is used to mark an area with a low pressure air system. A low air pressure system would cause thunderstorms, but the "L" does not mean that the area marked would cause a tornado.
Option A should be the correct answer. 
 
        
             
        
        
        
The uterine lining of the female's uterine cycle is shed during the menstrual phase. Menstrual cycle is a reoccurring cycle which begins at menarche and ends at menopause. During menstrual cycle, the endometrial lining prepares for pregnancy.
        
             
        
        
        
That is called uric acid and it helps them maintain internal homeostasis in hot climates by retaining water