How would you test each hypothesis? How would the Martians test each hypothesis?

What are the spectator ions in 2h+ + so42- + ca2+ + 2r → caso4 + 2h+ + 21?

Why is permeable soil best for plants that need a lot of drainage?

From the options provided for each element below, choose the properties that it may have based on its location in the periodic table fluorine (f): highly reactive nonmetal shiny a conductor