Which statement best describes the purpose of earth's spheres?
a. they work together as open systems to cycle matter through ecosystems.
b. they work independently as closed systems to cycle matter through ecosystems.
c. they work together as open systems to move matter to living and nonliving parts of
earth.
d. they work independently as closed systems to move nutrients to living and nonliving
parts of earth.

A

Explanation:

The spheres of the earth include the atmosphere, hydrosphere, lithosphere, and biosphere.  An example of how these systems interact with each other is; plants in the biosphere release oxygen into the atmosphere through photosynthesis while plants take up carbon dioxide from the atmosphere. The lithosphere releases carbon dioxide into the atmosphere through volcanic eruptions and etcetera.   Energy and matter cycles through these systems hence they are not independent of each other.

A

Explanation:

helen told me that she hoped i had enjoyed myself.