Sorry it’s messy, hope this helps :]
Answer:
Sodium
Explanation:
Sodium is a pure chemical, hence it can be represented by the single chemical symbol Na.
Water has a chemical symbol of H2O, consisting of two, and not one, symbols, H and O.
Sulfate ion consists of a sulfide ion and four oxygen ions (SO4)2-. Hence, it does not fit.
Finally, potassium chloride has a chemical symbol of KCl. Consisting of two different chemical symbols, (K and Cl), it does not fit either.
Hope this helped!
Answer:
Gravitational potential energy is greatest at the highest point of a roller coaster and least at the lowest point.
Explanation:
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The structure that helps these organisms in hypotonic environments is the contractile vacuole.
As water enters the cell from the less-solute environment, the cell would normally burst; however, the contractile vacuole takes up this water and pumps it back out of the cell.