Which two layers of the Earth do living things rely on the most? Why?

The Atmosphere, and the Surface of the Earth, including the Litosphere and the Hydrosphere.

Explanation:

Living organisms depend on the Atmopshere because it is the layer where several crucial cycles for life on Earth take place, like the Nitrogen Cycle and the Carbon Cycle.

Living organisms also depend on both the Litosphere and the Hydrosphere because these are the layers where they live. Terrestrial organisms dwell on the Litosphere, and water organisms dwell on the Hydrosphere.

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