Answer:
DNA is made of chains of four smaller molecules called "Nucleotides".
Explanation:
A molecule consisting of a nitrogen-containing base (adenine, guanine, thymine, or cytosine) in DNA is known as a nucleotides.
 
        
             
        
        
        
Answer:
d
Explanation:
I don't know, I'm just assuming
 
        
             
        
        
        
Answer:
Cellular respiration uses oxygen as a reactant and photosynthesis does not
Explanation:
Autotrophs use CO2 to make energy while heterotrophs use Oxygen.
<h3>Check all that apply?</h3>
You only gave one option so that's as far as I can get, sorry!
 
        
                    
             
        
        
        
population density are habitats, food, mates, and ... Decreases.  
 
        
             
        
        
        
B) the model does not show that cells can contain smaller structures inside. 
This is true because only a rubber ball was added, indicating that only a nucleus or any one organelle is present in a cell. However, the cell contains more than one organelle from the nucleus, mitochondria, Golgi apparatus, smooth and rough endoplasmic reticulum, ribosomes, and more. 
Another possible answer would be D since they model does not show the process of cellular respiration where cells undergo this process to create ATP in the mitochondria.