Unicellular Organisms:
- Bacteria: Bacteria are an example of unicellular organisms. They are single-celled microorganisms that can be found in various environments. They have a simple structure with no membrane-bound organelles.
- Yeast: Yeast is another example of a unicellular organism. It is a type of fungus that is commonly used in baking and brewing. Yeast cells are round and reproduce asexually through budding.

Multicellular Organisms:
- Humans: Humans are multicellular organisms composed of trillions of cells. Different types of cells in the human body work together to perform various functions such as digestion, respiration, and reproduction.
- Plants: Plants are multicellular organisms that have specialized cells for photosynthesis, nutrient transport, and structural support. They can be found in various shapes and sizes, ranging from tiny mosses to large trees.