Microorganisms

noun a single-celled microscopic organism that has no definite shape and moves by constantly changing its form

• The scientist observed the movement of the single-celled organism known as an amoeba under the microscope.
• I heard that an amoeba can change its shape to fit into tight spaces.
• That guy is like an amoeba, always changing his mind and adapting to different situations.
• Her ideas seemed to flow and change shape like an ever-moving amoeba.

noun a living thing that has the ability to act or function independently

adjective relating to or characteristic of a living thing

• The scientist studied the behavior of a single-celled organism under a microscope.
• My sister found a weird-looking organism in the backyard.
• Dude, that organism is so cool!
• The organization functioned like a living organism, with each department playing a vital role.

noun a member of the kingdom Protista, comprising single-celled eukaryotic organisms

adjective relating to or characteristic of protists

• Protists are a diverse group of eukaryotic microorganisms that are not plants, animals, or fungi.
• Did you know that protists are single-celled organisms that can be found in various environments?
• Protists are like the cool kids of the microscopic world.
• Just like protists, sometimes we may feel like we are small and overlooked in a big world.

noun a genus of freshwater protozoans known for their spherical shape and long, radiating pseudopods

• Actinophrys is a genus of freshwater protozoa known for their distinctive appearance and feeding behavior.
• Have you ever seen an actinophrys under a microscope? They look so cool!
• That actinophrys is like a tiny alien living in the water.
• Her dance moves were as mesmerizing as the tentacles of an actinophrys.