Answer:
D. Number of individuals in a specie
Step By Step Explanation:
        
                    
             
        
        
        
As we inhale air, oxygen enters the respiratory system and the circulatory system to transport it to the other parts of the body and to all cells. As the oxygen is already transported, the blood becomes deoxygenated and carries a CO2 which returns to the lungs and then we exhale the carbon dioxide.
        
             
        
        
        
False because the body needs different nutrition's from different food groups
        
             
        
        
        
I am pretty sure that the side of a mountain range that faces the wind often receives more<span> precipitation </span><span>than the downwind side of the same range.</span>
        
             
        
        
        
Answer:
Climate and slavery
Explanation: Slaves were the main reason that there was food before the end when Abraham was president. Climate and slavery can change how the crops were grown. I'd also say the geography was messed up then due to the climate. (sorry if wrong Q-Q)