Please explain the below question

Dear Student

The first reaction is photosynthesis in which carbon dioxide from air and water in the presence of sunlight and chlorophyll,  forms glucose. When this glucose is taken in by animals, it breaks down to carbon dioxide and water again (respiration ).

Carbon Cycle

 Carbon enters life forms through the process of photosynthesis. Photosynthesis is the process by which plants prepare food in the presence of sunlight and chlorophyll. During photosynthesis, carbon dioxide and water combine to produce glucose and oxygen. This changes the atmospheric carbon into glucose molecules.
 Glucose, which is a source of food, is utilized by organisms to produce energy during respiration. During this process, glucose is broken down in the presence of oxygen to produce carbon dioxide.
Thus, through the processes of photosynthesis and respiration, carbon is utilized and then returned to the environment.


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