Levels of Organization of Life Ecosystem Molecule Biome

Levels of Organization of Life • • Ecosystem Molecule Biome Organ system Biosphere Community Tissue • • • Atom Cell Organism Organ Population Organelle

1. • Atom • Smallest part of an element that has the properties of that element • Example: carbon, hydrogen, oxygen

2 • Molecule • Two or more atoms together • Example: Water (H 2 O), carbon dioxide (CO 2)

3 • Organelle • Part of cell that carries out a specific job • Mitochondria, nucleus

4 • Cell • Basic unit of life • Example: skin cell, nerve cell

5 • Tissue • Group of cells with a special job • Muscle tissue

6 • Organ • Group of tissues with a specific job • Heart, kidney

7 • Organ system • Group of organs that work together • Circulatory system, respiratory system, nervous system

8 • Organism • A living thing • Human, elephant

9 • Population • Group of organisms living in an area • Herd of elephants

10 • Community • All the living things (populations) that live in an area • Elephants, lions, shrubs, zebras

11 • Ecosystem • All the living things and the nonliving things in an area • Example: all the zebras, elephants, lions and the water, temperature/climate, etc.

12 Examples: • Biome • Region on earth with characteristic life and climate

13 • Biosphere • The collective area of Earth that supports life. • Example: Air, land, water

Levels of Organization of Life • • Atom Molecule Organelle Cell Tissue Organ system • • • Organism Population Community Ecosystem Biome Biosphere