Heterotrophic organisms depend on other organisms for nutrition. Fungi, animals, etc. Animals are heterotrophs. They do not have chlorophyll pigment to perform photosynthesis, so they feed on living organisms.
All animals are mobile, able to move spontaneously and independently at some point in their lives, and their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later in life. Most animals are mobile, using means such as walking, gliding, swimming, and flying to propel themselves through the world. Many single celled and microscopic organisms are also motile, using methods such as flagellar motility, amoeboid motion, gliding motility, and swarm motility. Unicellular organisms are made up of a single cell. There are millions of types, from yeast to algae to bacteria, but there are also small one celled animals, such as the slipper animalcule.
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