There are 5 Levels of organization in multicellular organisms

The cell is the basic unit of structure and function of a living thing.

Cells are specialized by size and shape for the job they do


Single Celled Organisms Amoeba.   Cells of Multi Cellular Organisms Red Blood Cells


Tissues are made of a group of similar cells that work together to do a specific job in the body

Examples: 4 different types of animal tissues are epithelial, muscle, nervous, and connective


Organs are made up of two or more tissues that work together to do a specific job kindoa like a team as they world together

Example: a heart is an organ made of all four tissues. Its pretty cool

Organ Systems

An organ system is a group of organs working together to perform particular jobs

Example: Human organ systems include circulatory, reproductive, digestive, nervous, respiratory.

Plant organ system-roots, stems,leaves


Sum of all cells, tissues, organs and organ systems makes an organism. An organisms is made when a group of organ systems work together

example: like fish, bears, birds, humans