Photosynthesis and cellular respiration interconnect plants and human beings.
Step-by-step explanation:
Plants prepare their own food and are autotrophs. Humans depend on autotrophs both directly and indirectly for food and are heterotrophs.
Heterotrophs consume both plants and animals to get energy
Photosynthesis: reactants - sunlight, carbon dioxide and water; products – sugar, oxygen
Cellular respiration: reactants - glucose and oxygen; products – water, carbon dioxide
Carbon dioxide (end product) released due to cellular respiration by the humans enters the atmosphere and is absorbed by the plants which become a reactant in photosynthesis.
Oxygen (end product) released due to photosynthesis by plants enters the atmosphere and is inhaled by human beings and becomes a reactant in cellular respiration.