Answer:
If it's triangles on one side it's a cold front
If it's a red line with semi circles then it's a warm front. 
 
        
                    
             
        
        
        
Answer:
Nitrogen is essential for all living things because it is a major part of amino acids, which are the building blocks of proteins and of nucleic acids such as DNA, which transfers genetic information to subsequent generations of organisms.
 
        
             
        
        
        
The onset of menopause will indicate about how many of
immature remains in the ovaries, during middle age, estrogen levels will start
to drop in which egg cells will start to stop to be produced in a female’s body,
the remaining immature egg cells will die. 
 
        
             
        
        
        
Finding the areas of each of the rectangles and squares of the net of a rectangular prism and adding up those areas gives the surface area or total surface area of the prism. For example, if the length of one side of the cube 4 units then the area of one its face is 4 × 4 = 16 square units.
        
                    
             
        
        
        
Answer: C. Water falls through openings in a dam turning turbine blades that generate electricity. Hope this helps, please rate Brainliest :)
Explanation: Renewable resources are resources that we can keep using without depleting the earths natural resources. Turbines and the waterfall are endless, not using up anything.