Ingestion in Amoeba:
- Amoeba obtains its nutrition through a process called phagocytosis.
- It extends its pseudopodia around the food particle and engulfs it, forming a food vacuole.
- The food vacuole contains digestive enzymes that break down the food into simpler substances.

Digestion in Amoeba:
- Within the food vacuole, the food is digested by the enzymes into smaller molecules.
- This process releases energy that is used by the amoeba for its various metabolic activities.

Absorption in Amoeba:
- The digested nutrients are absorbed through the cell membrane of the amoeba into its cytoplasm.
- These nutrients are then utilized by the amoeba for growth, repair, and reproduction.

Assimilation in Amoeba:
- During assimilation, the absorbed nutrients are converted into complex substances that form the cell components of the amoeba.

Egestion in Amoeba:
- The undigested waste material is expelled from the cell through a process called exocytosis.
- The waste material is released from the cell by fusing the food vacuole containing the waste with the cell membrane.
- This process ensures that the cell remains clean and free of any harmful waste materials.