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Soil & Water Conservation Society of Metro Halifax (SWCSMH)
February 10, 2008
Life is studied at the atomic and molecular scale in molecular biology, biochemistry, and to molecular genetics. At the level of the cell, it is studied in cell biology and at multicellular scales, it is examined in physiology, anatomy, and histology. Developmental biology studies life at the level of the development or ontogeny of an individual organism.
Moving up the scale towards more than one organism, genetics considers how heredity works between parent and offspring. Ethology considers group behavior of more than one individual. Population genetics looks at the level of an entire population, and systematics considers the multi-species scale of lineages. Interdependent populations and their habitats are examined in ecology and evolutionary biology. A speculative new field is astrobiology (or xenobiology) which examines the possibility of life beyond the Earth.
|Two empires||Three domains||Six kingdoms|
|Biota / Vitae|
|Acytota / Aphanobionta (Viruses, Viroids, ...) non-cellular life|
|Prokaryota / Procarya|
|Eukaryota / Eucarya||Eukaryota||Protista|
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