Select the correct order of the human body's hierarchical system that builds from SMALLEST to LARGEST units. * Tissue - Cellular - Chemical - Organism - Organ - Organ System Chemical - Cellular - Tissue - Organ - Organ System - Organism Cellular - Tissue - Chemical - Organ - Organ System - Organism Organism - Organ System - Organ - Tissue - Cellular - Chemical

B. Chemical - Cellular - Tissue - Organ - Organ System - Organism

Explanation:

The human body's hierarchical system that builds from smallest to largest units is : Chemical - Cellular - Tissue - Organ - Organ System - Organism.

Chemicals such as oxygen and carbon dioxide are the basic unit of the human body that forms atoms and biomolecules which further undergo chemical reaction to form cell or cellular, which is a basic unit of all life. Cells then form their functional groups called tissues and then different tissues form an organ. Different organs work together and form an organ system such as the digestive system and respiratory system. All the organ systems then form a living organism or human.

Hence, the correct option is "B. Chemical - Cellular - Tissue - Organ - Organ System - Organism".

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.