Understand the hierarchy of biological organization, which is a way to organize the complexity of life from the largest to the smallest scale.
The largest level is the 'Biosphere', which includes all ecosystems on Earth. It is the global sum of all ecosystems and represents the zone of life on Earth.
Next is the 'Ecosystem', which consists of a community of living organisms in conjunction with the non-living components of their environment, interacting as a system.
Following the ecosystem is the 'Community', which is an assemblage of different populations that live together in a defined area.
The 'Population' level includes all the individuals of a species living within a specific area, capable of interbreeding.
The smallest level is the 'Organism', which is an individual living entity that can react to stimuli, reproduce, grow, and maintain homeostasis.