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$\textbf{Photosynthesis}$ is the process in green plants and certain bacteria that converts sunlight, carbon dioxide, and water into glucose and oxygen.
$\textbf{Respiration}$ is the process occurring in all living organisms, where glucose and oxygen are broken down to release energy, carbon dioxide, and water.
They are related because they form a balanced cycle; oxygen produced in photosynthesis is used in respiration, and vice versa. Seasonally, they vary with higher activity in spring and summer due to temperature and water availability. In major climate types, they are influenced by factors like rainfall and temperature.