There Are 4 Valence Electrons So do the one with 4 valence electrons
        
             
        
        
        
It is the repiratory and the circulatory
        
                    
             
        
        
        
Answer:plants 
Explanation:the greener and more vegetated ecosystem is more healthier with plenty of habitat,food and moisture provided for other living organisms and also attracting agents like pollinators .
 
        
             
        
        
        
Answer:
I believe the answer is B.
Explanation:
It's not A, C and I don't think it's D.
As the Earth rotates, your region of Earth passes through both of these bulges each day. <u>When you're in one of the bulges, you experience a high tide. When you're not in one of the bulges, you experience a low tide.</u> This cycle of two high tides and two low tides occurs most days on most of the coastlines of the world.