Question

which interaction involves only one of earths spheres? plant roots take in water from the soil. plants take in carbon dioxide from the air. energy stored in plants is transferred to humans and animals that eat them.

Explanation:

The Earth has four main spheres - biosphere, hydrosphere, atmosphere, and geosphere. In the first option, plant roots (biosphere) take water from soil (geosphere), involving two spheres. In the second option, plants (biosphere) take in carbon - dioxide from the air (atmosphere), involving two spheres. In the third option, energy transfer from plants (biosphere) to humans and animals (biosphere) only involves the biosphere.

Answer:

Energy stored in plants is transferred to humans and animals that eat them.