Answer:
If there are no plants in the tank, they will run out of oxygen because there is nothing producing oxygen.
Explanation:
 
        
             
        
        
        
Any three characteristics of bacteria area 
- lack of membrane-bound organelles
- unicellular 
- small (usually microscopic) size. 
 
        
                    
             
        
        
        
Answer:
1) A 2) C?
Explanation:
1)<em> Most tropical places lay around the equator </em>2) <em>Tundra's can get cool</em>
 
        
             
        
        
        
Answer:
Base pairs are found in double-stranded DNA and RNA, where the bonds between them connect the two strands, making the double-stranded structures possible. Base pairs themselves are formed from bases, which are complementary nitrogen-rich organic compounds known as purines or pyrimidines.
Base pair | molecular biology | Britannicahttps://www.britannica.com › ... › Anatomy & Physiology
Explanation: