Levels of Organization

Why do we need to learn about levels of organization?

• Helps us to understand how our world fits together

• Helps us to organize the structures of living systems and how they all work together

Organelles• “little organs”

• Small structures inside of a cell that perform a specific function.

• Examples include mitochondria, nucleus, and Golgi body

Cell

Basic unit of structure & function in life. Cells are the building blocks of all living things.

Tissue

A group of the same kind of cells working

together for a specific purpose

Organs

A part of an organism made up of tissues that do

a specific job.

Organ Systems

A group of organs that work together for a specific job.

Organism

Any living thing.

Population• A group of the same organism living together.

•This word is often used to describe the size of the group.

Community

Several populations living together

and interacting in some way.

A community of Zebra, Wildebeest, Gazelle, and Lion populations in the Serengeti of Africa

Ecosystem

All the biotic communities plus all abiotic factors.