The answers are yeast and penicillium.
Some yeasts are used in medicine, for example, some Saccharomyces species, Candida species, etc. They are used for the production of some amino acids, vitamins (C, B2), some proteins (insulin). Penicillium is used for production of antibiotics.
        
             
        
        
        
<span>it is Method for determining Absolute Age</span>
        
                    
             
        
        
        
Answer:
The hydrogen bonds between water molecules
Explanation:
 
        
                    
             
        
        
        
Out of all the choises 
a. cells are the building blocks of life
b. cells all arise from pre existing cells
<span>c. cells are the basic living units of structure an function </span>
<span>d. all of above
</span>it would be d
        
             
        
        
        
Ecosystem and pond, 
not sure though but good luck !