Answer:
The four stages of the excretory system are:
1. Filtration
2. Reabsoprtion
3. Secretion
4. Excretion
Explanation:
Filtration - Waste is taken out of the bodily fluids by pressure filtration
Reabsorption - Clean bodily fluids are reabsorbed back into the body/blood
Secretion - Adding of toxins and wastes from the body fluids to the filtrate
Excretion - Expulsion/release of the waste products out of the body through urine, sweating, etc
