Answer:
D
Explanation:
Extracting DNA involves firstly harvesting the required cells (such as from the inside of cheeks), then the cells are broken up using enzymes or detergents. The products (usually a mixture of cell products –mainly RNA, DNA, and proteins) are then put in a centrifuge to separate the proteins from the DNA. 
 
        
             
        
        
        
Answer:
it is because there is less oxygen and creatures need more oxygen to perform their work..
hope this helps you ☺️☺️
 
        
             
        
        
        
Answer:
No, you cannot get STD from talking about it.
Explanation:
STD stands for sexually transmitted diseases spread from person to person. Usually spreader by sexual contact.
 
        
             
        
        
        
The Calvin cycle of photosynthesis starts when the energy of light is processed to chemical energy within the cells of plants. The ATP molecules created power the Calvin cycle. The Calvin cycle utilizes energy to create carbohydrates from h20 and co2.