Earth is considered a system because all of its parts

The given blank can be filled with interact.  

Earth is considered as a dynamic system, that is, a combination of interdependent, interrelated, or associating components creating an entity or a collective whole. On a macro level, the system of the Earth sustains its functions and existence as a whole via the associations or interactions of its components or parts.  

At a micro or lower level, it is beneficial to consider of the Earth system in terms of four central constituents known as the subsystem, that is, the geosphere, hydrosphere, biosphere, and atmosphere.  

Earth is considered a system because all of its parts are interrelated and interact

Earth consists of various components that are mutually supportive and related to each other

The earth can be said to be a system because each component inside it interacts so that it creates a very large number of collectivities

Components in the earth are incorporated into a Geosphere, namely a layer on the surface or under the surface of the earth that has a direct and indirect influence on the survival of creatures.

inside it

This geosphere consists of

The existence of these components and the presence of energy that flows between each other makes the earth interdependent with each other

Treatment of one component in the system will affect other components so that it can create a cycle that continues to occur as in the food cycle (food chain) or water cycle

So the components in the Earth's system are interrelated and interacting

the biosphere, hydrosphere, geosphere, and atmosphere are interconnected.

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Earth's Spheres Interact

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part of the Earth system

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Keywords: Earth, system, the biosphere, hydrosphere, geosphere, atmosphere

the answer is "a.) well–developed vascular system."

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