Answer:
a compound
Explanation:
a compound consists of two or more elements combined
Galactic is referring to the galaxy and cosmos! :)
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The reaction in which more reactive element replace a less reactive element from its compound is called displacement reaction.
Ex:-

The answer would be 4.
The agencies are:
Department of Agriculture's Forest Service (AFS)
Department of the Interior's Bureau of Land Management (BLM)
Fish and Wildlife Service (FWS)
National Park Service (NPS)
These four agencies cover around 95% of the land and are the only federal agencies.
I learned about these agencies in school.
So potassium is more reactive than lithium because the outer electron of a potassium atom is further from its nucleus than the outer electron of a lithium atom. Hope this answers the question. Have a nice day. Feel free to ask more questions.