2. Levels of Biological Organization I Subatomic Electron Neutron Proton Nitrogen Carbon Hydrogen Oxygen DNA Glucose Water Nucleus Chloroplast Mitochondrion Nerve Cell Atomic Molecular Organelle Cellular O H H CH 2 OH
3. Levels of Biological Organization II Tissue Nervous Tissue Brain Nervous System Pronghorn Antelope Organ (Organ) System Organism
4. Levels of Biological Organization III Population Herd of Pronghorns Hawk Water Earth’s surface Community Ecosystem Biosphere Pronghorns Hawk Grass Pronghorns Snake Bushes Soil Air Snake
Life on Earth is confined to a thin film encompassing Earth's surface: the biosphere. Earth, seen from the Moon, is an oasis of life in our solar system.