Answer:
Excretion is a process in which metabolic waste is eliminated from an organism. In vertebrates this is primarily carried out by the lungs, kidneys, and skin.
Carbon dioxide 
The liver regulates most chemical levels in the blood and excretes a product called bile. This helps carry away waste products from the liver. All the blood leaving the stomach and intestines passes through the liver. The liver processes this blood and breaks down, balances, and creates the nutrients and also metabolizes drugs into forms that are easier to use for the rest of the body or that are nontoxic.
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The correct answer is: A) lactic acid.
During the exercise, muscle cells use anaerobic respiration in order to make enough energy in the form of ATP. Anaerobic respiration doesn’t require oxygen, but glucose is broken down to produce energy. Glucose is broken down to pyruvate in the process called glycolysis. Next step is convert of pyruvate into lactic acid (or lactate).
During the exercise, the oxygen level in muscle cells decreases, which results in anaerobic respiration of the cells.
 
        
             
        
        
        
Answer:
depends on what you`re asking
In a cell: The Vacuole
In the body: Osmosis
 
        
                    
             
        
        
        
Answer:
B
Explanation:
Animals derive energy by eating plants or animals and using cellular respiration to make ATP. Plants capture energy from the sun via photosynthesis and make sugar and oxygen. They can then use the sugar to perform cellular respiration to derive energy.