Carbohydrates are naturally occurring sugars, starches and fiber in food. All carbohydrates are made up of sugar molecules. Sugar molecules linked together form starches and fiber. In the body, starches and sugars are broken down in the digestive system to glucose.
        
             
        
        
        

<u>Aerobic </u><u>respiration </u>:- Aerobic respiration is process of respiration in which complete oxidation of glucose takes place in the presence of oxygen 
<u>That </u><u>is</u><u>, </u>
<u>Aerobic </u><u>respiration </u><u>is </u><u>takes </u><u>place </u><u>in </u><u>four </u><u>stages </u><u>:</u><u>-</u>
- <u>Glycolysis</u>
- <u>The </u><u>link </u><u>reaction </u>
- <u>The </u><u>Krebs </u><u>cycle </u>
- <u>Oxidative </u><u>phosphorylation </u>
In aerobic respiration, Glucose with 6 carbon atoms broken into 2 pyruvic acid each with 3 carbon atom and produces water + CO2 + energy. 
<h3><u>Whereas</u><u>, </u></h3>
<u>Anaerobic </u><u>respiration </u>:- is the process of respiration in which incomplete oxidation of glucose takes place in the absence of oxygen 
The end products of glucose in anaerobic respiration is 
- <u>In </u><u>human </u><u>muscles</u><u>, </u><u> </u><u>Lactic </u><u>acid </u><u>+</u><u> </u><u>Energy </u>
- <u>In </u><u>yeast</u><u>, </u><u>Ethanol </u><u>+</u><u> </u><u>CO2</u><u> </u><u>+</u><u> </u><u>Energy </u>
<u>Hence</u><u>, </u><u>Option </u><u>D </u><u>is </u><u>the </u><u>correct </u><u>answer</u><u>.</u>
 
        
             
        
        
        
Answer:
The cilia is one of the things that act defensively in the respiratory system. 
Explanation:
It propels a mucus-like liquid that covers the airway which traps pathogens (potentially infectious microorganisms) and other particles, preventing them from reaching the lungs.
 
        
             
        
        
        
Some of the main functions of skin cells are to provide protection, perceive and transmit sensation, control evaporation and regulate temperature.<span> Skin cells, which are epithelial cells, are also self-repairing and reproduce quickly.</span>
        
                    
             
        
        
        
B. tiny algae and plankton decomposed under conditions of heat, pressure, and low oxygen. 
Explanation:
Oil is most likely to form where tiny algae and plankton decomposed under conditions of heat, pressure and low oxygen. 
   Coal will form when plant materials like twigs, leaves and tree trunks decomposed under conditions of heat, pressure and low oxygen. 
- To form oil, algae and plankton will be gathered with sediments in a basin. 
- Rapid burial causes the algae and plankton to be cut off from aerobic environment that would lead to the decay of these organisms. 
- They are buried alive and as the basin subsides, temperature and pressure acts to produce kerogen. 
- Further cracking produces oil and gas. 
Learn more: 
Fossil fuel brainly.com/question/9231468
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