Atoms​

Molecules​

Organelles

Cells

Tissues

Organs

Organ systems

Organisms

Populations

Ecosystems

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​In order...

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The smallest unit is the atom.

The smallest living unit is the cell.

The largest singular unit is the organism.

Largest unit is the biosphere​.

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​Life's order

Molecules

​A combo of similar atoms

Consists of two atoms bonded chemically together.

An organelle is a specialized subunit, usually within a cell, that has a specific function.

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The mitochondria is the powerhouse of the cell!

​Organelles

The cell is the basic structural and functional unit of life.

​The smallest living unit

A collection of organelles​.

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​Cell

In simple terms, tissue can be defined as a group of cells with similar shape and function are termed as tissues.

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​Tissue

A biological system consisting of a group of organs that work together to perform one or more functions.

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​Organ System

Any organic, living system that functions as an individual entity.

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​Organism