The circulatory system - hemoglobin in the blood transports oxygen :)
        
             
        
        
        
The chemical reactions in the cell would not happen as fast and would require more energy to catalyze the reaction between the two reactants.
Mark brainliest if I helped you 
Chemistry/ Example: Take breathing for example, when you breath you breath out carbon dioxide. The CO2 can't just leave like that and only 10% binds to hemoglobin. The rest turns into carbonic acid in your blood and its plasma. However, the acid is unstable, so it turns into bicarbonate and a dissociated proton (H). You have carbonic anhydrase that converts the two so you can breath out CO2; the carbonic acid separates into H2O and CO2. This process would take a LONG time without the enzyme-- CO2 build up, even minimal amounts it lethal. 
        
             
        
        
        
Answer:
Reproduction is important for the survival of all living things. Without a mechanism for reproduction, life would come to an end.
Explanation:
Reproduction is a characteristic of all living systems; because no individual organism lives forever, reproduction is essential to the continuation of every species.
 
        
             
        
        
        
Soil can cause a natural disaster by soil erosion
        
             
        
        
        
Answer:
B.) Smoking tobacco products or inhaling second-hand smoke
Explanation:
It can cause lung cancer
May i get brainlest please?