The term single-celled animals refers to organisms that are composed of a single cell, such as amoebae. Amoebae are microscopic, unicellular organisms that can move and change shape. They are found in a variety of habitats, including freshwater, soil, and marine environments. Amoebae reproduce asexually by dividing into two daughter cells. They feed on bacteria and other small organisms, using their pseudopods to capture prey. Amoebae are an important part of the food chain, providing nutrition for larger organisms.