Levels of Organization Molecular Level Molecules are made

Levels of Organization

Molecular Level • Molecules are made up of atoms. • Organisms are made of small molecules such as water or H 2 O and large molecules called macromolecules.

The 4 macromolecules of life • Proteins: provide structure and act as enzymes for chemical reactions • Lipids: provide insulation and long term energy storage • Carbohydrates: Used for short-term energy • Nucleic Acids: DNA and RNA-store genetic information

Cellular Level Classic Cell Theory: 1. All living things have at least 1 cell. 2. Cells come from pre-existing cells. 3. Cells are the smallest units of life.

Cellular Level

Tissue Level • A group of cells that performs a specific function in a multicellular organism

Organ Level • Several different types of tissues that work together for a specific purpose make up an organ

Organ System Level • An organ system is made of several organs that work together to perform a function

Organism Level • An individual living thing is an organism

Population Level • A group of organisms of the same species that live in the same location is a population

Community Level • All the different species of organisms in a particular location

Ecosystem Level • The community of living organisms as well as the abiotic (non-living) factors of the environment • Biotic factors: living • Abiotic factors: non-living

Biome Level • Biomes are large ecosystems that have the same climate and community of organisms

Biosphere • The part of the Earth that contains all ecosystems