Answer:
I think it is A loss of biodiversity.
Explanation:
Sorry if it is wrong.
 
        
                    
             
        
        
        
Answer:
I am expecting that option c or d is correct
 
        
             
        
        
        
True. Greenhouse gases are composed of many molecular components that provide and are necessary for life to still exist on earth. For example, the carbon dioxide and the others alike. However, when these exceed the necessary level and amount in the atmosphere, they cause tremendous increase in temperature. 
        
                    
             
        
        
        
Tumor cells are cells that divide relentlessly, forming solid tumors or flooding the blood with abnormal cells.
        
             
        
        
        
Effacement: The cervix – which is normally long and thick, measuring about 1-2 inches, starts to get shorter and thinner. This process is known as effacement. As the cervix gets more and more effaced, it gets shorter and shorter and “pulled up” into the lower part of the uterus.
Dilation: At the same time, the cervix softens and begins to open up – known as dilation. This widening, allows a smooth passage for the baby’s head and the rest of the body from the uterus into the vaginal canal.