I would think radon would be the most reactive.
To answer this question, you need to convert the gallon unit into liter. For every gallon of milk, there would be 3.78541 liters of milk. Then, the calculation would be: 334 gallon x 3.78541liter/gallon= 1264.32 liters.
If you make it into scientific notation then it would be 1.26 x 10^3
Sodium is Na, so there's 3 moles of that. Phosphorus is P, there's 1 mole of that. Oxygen is O, there's 4 moles of that.
It should be D, cells are parts, tissue is part and organ is part of a system.
