The Hierarchy or Levels of Biological Organization

units of matter below the size of an atom Subatomic (particle) units of matter below the size of an atom

Atom basic unit of matter

Molecule electrically neutral group of two or more atoms held together by covalent chemical bonds (Compound- pure chemical substance consisting of two or more different chemical elements) Caffeine

Macromolecule very large molecule, composed of hundreds or thousands of atoms DNA or protein, esp. a polymer,

Organelle Specialized part of a cell having some specific function

Cells Basic unit of life

Tissue a group of cells that perform a similar function

Organs a collection of tissues joined as unit to serve a common function;

is a group of organs that work together to perform a certain task. Organ Systems is a group of organs that work together to perform a certain task.

Organism A single individual

Population A group of organisms of the same type (species) living in the same area.

Bacteria (That’s too small to see.) Community Populations that live together in a given area.(Human population, House Elf population, Bacteria population) Pretend living thing! Bacteria (That’s too small to see.)

Ecosystem Communities and the nonliving surroundings. (Urban Ecosystem)

A major regional or global biotic community Biome A major regional or global biotic community Deciduous Forest of England

Hogwarts is around the other side. Biosphere All of the land, water and air (biomes) where organisms can live.

Earth Planets Solar Systems Galaxies Universe

Realm of Ecology