Organisms:
* Multicellular organisms: All living things that are not single-celled (like bacteria or amoebas) are made up of many cells. This includes plants, animals, fungi, and even some algae.
* Tissues: Groups of similar cells working together to perform a specific function (e.g., muscle tissue, nervous tissue).
* Organs: Structures composed of different tissues working together for a common purpose (e.g., heart, brain, stomach).
* Organ systems: Groups of organs that cooperate to carry out major bodily functions (e.g., circulatory system, digestive system).
Other things:
* Colonies: Groups of single-celled organisms living together, sometimes with a division of labor. For example, a colony of bacteria.
* Biofilms: Communities of microorganisms that adhere to a surface, often forming a protective layer.
Let me know if you'd like more information on a specific example!
