- The kidneys receive blood through the renal artery - The blood is passed through the nephrons in the kidneys - The kidneys filter the waste from the blood - The clean blood is circulated out of the kidneys What might be the last step of the process?
Ans: Excess water and waste is expelled from the kidneys in the form of urine.

- Sunlight strikes the chlorophyll molecules in the plant - Is trapped - Plant also takes in water and carbon dioxide from the environment - The plant forms glucose What might be the last step of the process?
Ans: The plant releases oxygen into the atmosphere.

- Water from the surface seeps below the soil - The water comes into contact with the rock below - The rock over the years carves through the rock - The space in the rock becomes larger and forms into a cave What might be the last step of the process?
Ans: As more rather rushes through the cave becomes a cavern.

- A man and woman mate - Embryo is C - Embryo grows and develops into a fetus inside the woman's womb - The fetus is born - Begins to grow and develop through infancy and childhood - In the teenage years the human experiences puberty - Reaches sexual maturity - At 18 the human becomes an adult What might be the last step of the process?
Ans: Adult may procreate continuing the cycle.