Answer: Research with embryonic stem cells may lead to new, more effective treatments for serious human ailments and alleviate the suffering of thousands of people.
Explanation:
 
        
             
        
        
        
Group 7A, the Halogens contain metalloids such as Astatine.
        
             
        
        
        
Answer:
'Adds' is the correct option
Explanation:
During cellular respiration, glucose and oxygen are changed into energy and carbon dioxide. Therefore, carbon dioxide is released into the atmosphere during the process of cellular respiration.
 
        
             
        
        
        
The fly species Drosophila santomea is found only on a single small island. Thus, this fly is considered to be "Endemic".
        
             
        
        
        
Answer:
four
Explanation:
Carbon atoms have four electrons in their outer shell. So, it exhibits tetravalency & thus, a single carbon atom can form a maximum of four (4) bonds with other atoms