Q: What is the missing first step of the following process:  -  The liver uses chemicals and proteins to treat the blood - The blood is cleaned - Energy is produced - The blood leaves the liver cleaned.
A: Blood is sent to the liver

Q: What is the missing first step of the following process:  -  Food is chewed and mixed with saliva (spit) - Food travels down the esophagus (throat) - Food travels into the stomach - Acid in the stomach breaks the food down further - Food travels into the small intestine - Nutrients from food are absorbed into the blood stream - Food travels into the large intestine - Most of the remaining material is now waste - The waste is eventually removed from the body.
A: Food is put into mouth

Q: What is the missing first step of the following process:  -  Food begins to be processed by the digestive system - The pancreas releases enzymes to aid digestion - Digested food affects the amount of sugar in the blood - The pancreas releases one hormone to lower the blood sugar (glucose) level - The pancreas releases another hormone to raisethe blood sugar (glucose) level.
A: Food enters the body

Q: What is the missing first step of the following process:  -  The water freezes into ice - The cracks expand - Over time the rocks split - The rocks are now in smaller pieces.
A:
Water gets into cracks in rocks