education that is considered to be the first stage of “basic education”

material or energy entering the system being studied that has been drawn from the environment without previous human transformation, or material or energy leaving the system being studied that is released into the environment without subsequent human transformation

material or energy entering the system being studied that has been drawn from the environment (3.2.2) without previous human transformation (3.8.26), or material or energy leaving the system being studied that is released into the environment without subsequent human transformation

material or energy entering the system being studied that has been drawn from the environment without previous human transformation, or material or energy leaving the system being studied that is released into the environment without subsequent human transformation

material or energy entering the system being studied that has been drawn from the environment without previous human transformation, or material or energy leaving the system being studied that is released into the environment without subsequent human transformation

water entering the system being studied that has been drawn from the environment (3.2.2), or water leaving the system being studied that is released into the environment

water entering the system being studied that has been drawn from the environment, or water leaving the system being studied that is released into the environment