This is because iron is used to make a protein called hemoglobin. This protein helps blood cells carry oxygen around the body.
 
        
             
        
        
        
I believe it is c 100x because you multiply the 10 by the power of the eye piece which is usually 10 and 10 multiplied by 10 is 100
 
        
             
        
        
        
Answer:
Chloroplast
Explanation:
Chloroplasts are organelles found in green plants. They are the sites of photosynthesis. Chloroplasts contain chlorophyll, a photosynthetic pigment that traps light energy. This energy is used to power a series of reactions that convert water and carbon dioxide into sugars.
 
        
             
        
        
        
The correct answers are 2. arid climate and 4. oil resources
The climate always causes environmental climate, especially arid one, while oil both extraction and production creates environmental problems.
        
             
        
        
        
The dose should be adjusted to achieve and maintain therapeutic drug levels