The amoeba feeds on other protozoans and unicellular algae by engulfing them in its pseudopodia. This "cell eating" phenomenon (called phagocytosis) is also exibited by human white blood cells called phagocytes.

Many protozoans like amoeba possess finger like out projections called pseudopodia which help them in locomotion and phagocytosis. The human leucocytes or white blood cells also exhibit pseudopodia. So, option c is correct.

Pseudopodia are temporary cytoplasmic extensions that are formed by certain cells, allowing them to move and capture prey or engulf particles. They are commonly found in amoebas, which are a type of protozoan. However, pseudopodia can also be formed by other protozoans and certain white blood cells called leucocytes.

Explanation:
- Pseudopodia in Amoeba:
Amoebas are unicellular organisms that belong to the group of protozoans. They have a flexible cell membrane that allows them to change their shape. Amoebas use pseudopodia for locomotion and feeding. When an amoeba extends a pseudopodium, it pushes the cytoplasm forward, allowing the organism to move in that direction. The pseudopodium then attaches to a surface, and the rest of the cell moves forward, pulling the rest of the cytoplasm with it. This process is known as amoeboid movement.

- Pseudopodia in Leucocytes:
Leucocytes, also known as white blood cells, are an essential part of the immune system. They play a crucial role in defending the body against pathogens and foreign substances. Some types of leucocytes, such as neutrophils and macrophages, can form pseudopodia. These pseudopodia help the leucocytes to move towards the site of infection or inflammation. Once they reach the target, they can engulf and destroy the pathogens or foreign particles through a process called phagocytosis.

- Pseudopodia in Many Protozoans:
Protozoans are a diverse group of unicellular eukaryotic organisms. Many protozoans, including amoebas, use pseudopodia for locomotion, feeding, and capturing prey. Pseudopodia allow them to extend their bodies in various directions, helping them to move through their environment. Some protozoans also use pseudopodia to engulf food particles by surrounding them with their cell membrane and forming a food vacuole.

- Conclusion:
Pseudopodia are temporary cytoplasmic extensions that are commonly formed by amoebas and leucocytes. While amoebas primarily use pseudopodia for locomotion and feeding, leucocytes use pseudopodia for immune responses. Additionally, many other protozoans also form pseudopodia for various purposes. Therefore, the correct answer is option 'C' - pseudopodia are commonly formed in many protozoans and leucocytes.