AP BIOLOGY

Detailed explanation-1: -The biological levels of organization of living things arranged from the simplest to most complex are: organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.

Detailed explanation-2: -The major levels of organization in the body, from the simplest to the most complex are: atoms, molecules, organelles, cells, tissues, organs, organ systems, and the human organism.

Detailed explanation-3: -Organization of Living Things Biologists recognize 12 levels of organization in the living world. From the simplest to the most complex, these levels include atoms, molecules, organelles, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystems, and finally biospheres.

Detailed explanation-4: -Many organ systems are then organised and form an organism. So, the correct order is: Cells-Tissues-Organs-Organ systems-Organism.