Correct answer: Glycogen  
Glycogen is a form of polysaccharide of glucose molecule which serve as energy storage unit in the humans. The excess glucose in the body is stored in the form of glycogen in the muscles and the liver.
The muscles can store upto 500 gram of glycogen and liver can store 100 gram of glucose. Therefore, any carbohydrate which is consumed beyond this limit are converted to and stored as fat.
Glycogen that are stored in muscle are broken down into glucose while  the liver cell glycogen are broken down into glucose as a circulating energy source to be used by the body.
  
 
        
                    
             
        
        
        
D. metamorphic -> melting -> igneous -> erosion
Explanation:
The sequence that would be the best possible for a rock going through the rock cycle is metamorphic rocks melting to produce igneous rocks that are eroded. 
- The rock cycle shows the pathway by which different rock types are formed. 
- The origin of the formation of rocks starts with the production of magma. 
- Igneous rocks are formed from cooling and solidification of molten magma. 
- Metamorphic rocks are formed from the subjection of igneous and sedimentary rocks to high temperature and pressure. 
- Sedimentary rocks are formed from weathering, erosion, transportation and deposition of rocks. 
- Option D shows a metamorphic rock melting to give igneous rocks and the igneous rock is eventually eroded to form sedimentary rocks. 
learn more: 
Sedimentary rocks brainly.com/question/2740663
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The factor that would least affect photosynthesis is Nitrates in the soil.
Photosynthesis is the process by which plant make their own food by utilizing energy from sunlight, water and carbon dioxide. The limiting factors that affect photosynthesis are the light intensity, carbon dioxide concentration, temperature and water. Without enough light, a plant cannot photosynthesize very quickly, even if there is plenty of water and carbon dioxide. 
        
             
        
        
        
Storing sperm and Egg cells to later create babies when desired.
Parents controlling the baby sex that is produced.
        
             
        
        
        
Answer: Organelles, Cell, Proteins, Tissue, Organ, Organism.
Explanation: I hope this helps, I had this subject a month or so back and I still have my notes.