NOVELTY - Digesting biomass, comprises: processing portion of biomass in first unit to undergo first digestion which is performed at first temperature; processing another portion of biomass in second unit, where another portion in second unit undergoes second digestion that is performed at second temperature; processing further portion of biomass in third unit that undergoes third digestion, where the third digestion is performed at third temperature; and diverting portion of feed stream from third unit, where diverting provides bio product suitable as one of e.g. fuel and gas.    USE - The method is useful for digesting biomass and producing bio product that is used as fuel, supplement, fertilizer, and gas (all claimed), methane and bio solids.    ADVANTAGE - The method: provides United states environmental protection agency classified class A bio solids and pathogen reduced organic fertilizer; enhanced biomass conversion efficiency and improved output of products (in quantity and/or quality) with reduction in dwell time in each phase; utilizes digester that accommodates a large variety of organic waste, and enable reductions in digester volume and/or reactor size, thus leading to reduced capital costs and reduced energy requirements; reduces overall amount of water consumed; is carried without regular biomass bio supplements; provides stable anaerobic digestion and uninterrupted plant operation with reduced plant upsets; and yields reduced volume of non- decomposed effluent solids.    DETAILED DESCRIPTION - Digesting a biomass, comprises: processing at least a portion of the biomass in a first unit to undergo a first digestion, where the first digestion is performed at a first temperature; processing at least another portion of the biomass in second unit, where another portion of the biomass is transferred from first unit to second unit, and the biomass in second unit undergoes second digestion that is performed at a second temperature that is higher than the first temperature; processing at least a further portion of the biomass in least one third unit, where the further portion of the biomass is transferred from the second unit to the third unit that undergoes third digestion, and the third digestion is performed at a third temperature that higher than either the first temperature or the second temperature; and diverting at least a portion of feed stream from the third unit after undergoing the third digestion, where diverting provides a bio product suitable as at least one of a fuel, supplement, fertilizer and gas. INDEPENDENT CLAIMS are also included for:    (1) a system for digesting a biomass, comprising the first unit for processing biomass in first digestion; the second unit for processing biomass in second digestion; third unit for processing biomass in third digestion; a diversion unit for transferring at least a portion of feed stream from the third unit to provides the bio product; and    (2) a composition obtained from the system.