[Q]: What is the missing first step of the following process: - Fill the tray with cool water - Place the tray in the freezer - Leave the tray in the freezer for a few hours - Take they tray out of the freezer - Pop the ice cubes out of tray.
****
[A]: Get an ice cube tray

[Q]: What is the missing first step of the following process: - These plants die - The soil gains organic material - The soil becomes more fertile - Larger plants are able to be supported - Trees eventually grow.
****
[A]: Grass and small plants grow in an area

[Q]: What is the missing first step of the following process: - Waste enters the kidneys - A processing moment in the kidneys let waste and fluid pass - Prevents larger molecules to pass - Fluid goes back to the bloodstream - Bad waste is removed - The final product is turned into urine.
****
[A]: Fluid

[Q]: What is the missing first step of the following process: - Sulfur in the coal combines with oxygen to form sulfur oxides - The sulfur oxides are released into the atmosphere - The sulfides combine with oxygen in the atmosphere to form sulfur trioxide - The sulfur trioxide reacts with water in the atmosphere to form sulfuric acid, a very strong acid - The sulfuric acid makes the rain acidic -
****
[A]:
Coal is burned