Answer:
Example of toxin; Arsenic.
How does it contribute to diabetes; overconsumption 
 
        
             
        
        
        
Answer:
The alveolar walls and capillary walls share a membrane. That's how close they're getting. This allows oxygen and carbon dioxide to readily pass from the respiratory system to the circulation. Oxygen molecules bind to red blood cells as they return to the heart.
 
        
             
        
        
        
Answer:
Chromosomes must still be copied.
the cell must double in size.
the nuclear DNA must double.
Explanation:
 
        
             
        
        
        
<h2>Answer:</h2>
Bacteria provide genetic engineers with <u>_vector_ </u>and <u>_host_.</u>
<h3>Explanation:</h3>
Vector are vehicles or carriers which are used to carry the gene of interest. They are usually plasmids which are bacterial circular genome which can replicate independently.
Hence bacterial plasmids are used for the insertion of gene of interest and its transfer to the host cell.
As plasmids is taken from the bacteria, so mostly bacteria is used as the host for the gene of interest.
 
        
        
        
A:2 because atp molecules production has same explanations