Answer:
The right answer is D
Explanation:
They use carbon dioxide, water and sunlight to make carbohydrates. And the oxygen is just a byproduct. No real organic molecules are needed before.
 
        
             
        
        
        
Matter is made up of atoms and has mass. This is because for anything to be considered matter it must contain atoms and atoms must have mass.
        
             
        
        
        
The cells, organelles, and the tissues of the body are measured in micrometers. The size of the cells, tissues, and various organelles are very small. Majority needs the help of microscope to be seen. Therefore, the larger units of the metric system cannot be used to measure their sizes. Hence, the smaller unit, such as the micrometer is used for their measurement purpose. 
The given blank can be filled with micrometers.