Simple squamous epithelium
        
             
        
        
        
Sink holes and crevasses might be a result of this <span />
        
             
        
        
        
Answer:
1: sustainability is an avoidance of the depletion of natural resources in order to maintain an ecological balance.
2: Sustainability means meeting our own needs without compromising the ability of future generations to meet their own needs. 
Explanation:
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Fetus can survive an extra copy of a chromosome, but being hemizygous is <span>usually fatal</span>