Biological diversity, often shortened to biodiversity, is the variation of life at all levels of biological organization, referring not only to the sum total of life forms across an area, but also to ...

As this example illustrates, units of matter are organized and integrated into levels of increasing complexity; this is a concept referred to as integrative levels of organization. Integrative ...

How do scientists study and classify life-forms? How can we understand ... shows that evolutionary history is decoupled from biological organization. Indeed, archaea and bacteria appear very ...

Discussion of the major principles by which life is organized. Topics include scientific methods, biological chemistry, cell structure and organization, multicellular organization, diversity of ...