The best description about the brain stem is: it is the most important organ of our body's survival. It connects the brain and the spinal cord, controls the vital organs like the lungs and heart and it also coordinates the many essential body reflexes.
        
             
        
        
        
The chemical formula C6H12O6 is the chemical formula of glucose which is a monosaccharide containing an aldehyde group (-CHO) with 6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms. Glucose is a product produced from photosynthesis.
The chemical molecular formula for the photosynthesis process is 6CO2+6H2O→C6H12O6+6O2. The synthesis process is a reaction that occurs in plants to produce food to be used as energy for cells. The process of photosynthesis requires materials in the form of air which is represented by H2O and carbon dioxide which is represented by the formula CO2 in the chemical formula of the photosynthesis process. The products of photosynthesis are glucose which is represented by C6H12O6 and oxygen which is represented by O2 in the chemical formula.
Some people often refer to the chemical formula of photosynthesis as CO2+H2O→C6H12O6+O2, this formula is an unbalanced equation. Because the auction will produce glucose with the chemical formula C6H12O6 having 6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms, then should the chemical formula carbon dioxide H2O and water O2 also have a total of 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms.
Learn more about  photosynthesis at:
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c.Chromatin in the nucleus condenses.
Prophase is the 1st stage. So in Prophase chromatin don't condence. It occurs at anaphase. 
 
        
             
        
        
        
Answer:
The conclusion is that different matters have different biomass percentages.
Explanation:
Different matters have different biomass percentages because they are formed from different elements. each biomass is formed from the elements such as carbon, oxygen, hydrogen and nitrogen. for example, the human body is composed of 30 percent of biomass while 70 percent is water. the percentages of different elements are carbon (12%), nitrogen (0.6%), hydrogen (62.9%), oxygen (24%), calcium (0.24%) and phosphorus (0.14%). At each level, only 10 percent of biomass is transferred to another level and remaining 90 percent releases in the form of heat.