What is a simple form of movement in unicellular organisms?

Movement is one of the significant features of living beings. Streaming of protoplasm in the unicellular organisms like Amoeba is a simple form of movement.Movement of cilia, flagella and tentacles are shown by many organisms. Movement is one of the significant features of living beings and animals and plants exhibit a wide range of movements.Streaming of protoplasm in unicellular organisms like Amoeba is a simple form of movement. The methods of locomotion performed by animals vary with their habitats and the demand of the situation, but the main purpose is to search for food, shelter, mate, suitable breeding grounds, favourable climatic conditions, or to escape from enemies/predators.