Which of the following statements about the interaction of earth’s systems is true?
a.
the interaction between earth’s systems is limited to a response to human activity.
b.
the earth’s system interact using positive feedback only.
c.
the earth’s systems interact using negative feedback only.
d.
all of the earth’s systems interact with each other.

The correct answer is option D, All of the Earth’s systems interact with each other

Explanation:

The four spheres of earth primarily  

a)Geosphere – consisting of rock and soil such as Earth’s core, mantle, and crust

b)Hydrosphere – consisting of water such as Earth’s oceans, lakes, rivers, groundwater, glaciers, polar ice caps, rain, and snow

c)atmosphere – consisting of Air, such as Earth’s oxygen, nitrogen, water vapor, ozone, and wind

d)biosphere - consisting of  Life , such as plants, humans, animals, insects and microbes

Interact with each other to share the material and energy between them. Some common examples include – evaporation of  water (hydrosphere ) to reach the air (atmosphere), Humans (biosphere) constructing something using the rock material (geosphere) etc.  

bal is blood alcohol level. bac will normally be higher in a person with more body fat. so the answer to your question would be, as body fat decreases, the increasing rate of bal decreases.