Which of the following statements best describes the principles behind the Gaia hypothesis? A) The Earth behaves as a self-regulating system of physical and biological processes B) Actions by one organism in an ecosystem must affect other organisms in the system C) Changes in input to a system result in linear or nonlinear changes to the output of the system D) Positive feedback generally results in the destabilization of a system.

The statement 'the Earth behaves as a self-regulating system of physical and biological processes' BEST describes the principles behind the Gaia hypothesis (Option A).

The Gaia hypothesis (also called the Gaia principle) is an explanation to understand how Earth can sustain life by the interaction of the organisms with their surrounding inorganic environment.

The Gaia hypothesis states that the delicate equilibrium on the Earth planet is achieved by the interaction between its biotic and abiotic components.

This hypothesis (i.e., the Gaia hypothesis) was proposed by James Lovelock in 1972.

In conclusion, the statement 'the Earth behaves as a self-regulating system of physical and biological processes' BEST describes the principles behind the Gaia hypothesis (Option A).

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