The biosphere is the combination of the all the ecosystem present on the earth.
In a biosphere the plants are the organism, which convert the energy of the sunlight in to food (usable form of energy for the consumers) by the process of photosynthesis. The food is transferred from the the producers (plants) to the animals (consumers).
In case, the photosynthesis does not occur, the organism present in the biosphere cannot utilise the energy.
Food and liquids are processed by the digestive system. After nutrients are absorbed during digestion, the excretory system removes solid waste products, or feces, through the rectum. The excretory system also works with the respiratory and circulatory systems and removes carbon dioxide (CO2) from the body.
