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Amoebae are organisms made up of only one cell. They are predatory and eat other, smaller microbes. The liquid present within a cell is called the cytoplasm, and it can be categorized based on its texture. The cytoplasm towards the periphery of the cell is more rigid and is called ectoplasm (Greek: ektos; which means outer). The portion of cytoplasm in the rest of the cell and the core is called the endoplasm (Greek: éndon; which means inner). Imagine filling a polythene bag with water. If you play around with it, you will notice that the water inside the bag changes the shape of the bag as it moves around. Similarly, cytoplasm moves around inside the amoeba cell to form structures that protrude outwards, called pseudopodia.
In the video, you will see how the amoeba engulfs a microbe, called Paramecium, using these pseudopodia. You may ask, how do the two pseudopodia re-join on the other end? If you have seen bubbles, you may have noticed that two bubbles often merge into one bigger bubble when in contact. The cell membrane, or the covering that keeps the cytoplasm and cell structures contained, acts similarly. Check out this video to watch an apex predator under a microscope.