Amoeba are protozoans. They eat algae and other protozoans. Protozoans are eaten by zooplankton in the marine environment.
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Not intentionally, for when they do - the virus eats them.
When an amoeba eats a bacteria, it engulfs the bacteria into its cytoplasm through a process called phagocytosis. The bacteria is then enclosed in a food vacuole and digested by enzymes within the vacuole, providing the amoeba with nutrients for energy and growth. Any waste products from the digestion process are expelled from the cell.
When an amoeba eats, the food vacuole organelle will help store the food particles that have been ingested. Additionally, lysosomes will aid in digesting the food within the food vacuole by releasing enzymes to break down the food into smaller molecules for absorption.
An amoeba cell eats other unicellular organisms like paramecium, bacteria, and plant cells. Some are even parasitic! Amoeba cells eat by moving its cytoplasm (also called pseudopods) around its prey. The prey is literally inside the amoeba now. The Amoeba forms a vacuole around it and breaks it down for nourishment and absorbs it through its cytoplasm.
The primary sources of energy for an amoeba are organic matter such as bacteria, algae, and other small organisms that it engulfs through phagocytosis. Once ingested, the amoeba breaks down these organic molecules into nutrients like sugars and amino acids to generate energy through cellular respiration.