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Arete (Ancient Greek: ἀρετή, romanized:aretḗ) is a concept in ancient Greek thought that, in its most basic sense, refers to "excellence" of any kind [ 1 ] —especially a person or thing's "full realization of potential or inherent function." [ 2 ] The term may also refer to excellence in " moral virtue." [ 1 ]
Arête. Striding Edge, an arête viewed from Helvellyn with the corrie Red Tarn to the left and Nethermost Cove to the right. An arête (/ əˈrɛt / ə-RET; French: [aʁɛt]) [1] is a narrow ridge of rock that separates two valleys. It is typically formed when two glaciers erode parallel U-shaped valleys. Arêtes can also form when two glacial ...
539 Ma – present. The Phanerozoic Eon (Greek: period of well-displayed life) marks the appearance in the fossil record of abundant, shell-forming and/or trace-making organisms. It is subdivided into three eras, the Paleozoic, Mesozoic and Cenozoic, with major mass extinctions at division points.
Embryological origins of the mouth and anus. The embryological origin of the mouth and anus is an important characteristic, and forms the morphological basis for separating bilaterian animals into two natural groupings: the protostomes and deuterostomes. In animals at least as complex as an earthworm, a dent forms in one side of the early ...
Aristotle's biology. Among Aristotle's many observations of marine biology was that the octopus can change colour when disturbed. Aristotle's biology is the theory of biology, grounded in systematic observation and collection of data, mainly zoological, embodied in Aristotle 's books on the science. Many of his observations were made during his ...
A human chimera is a human with a subset of cells with a distinct genotype than other cells, that is, having genetic chimerism.In contrast, an individual where each cell contains genetic material from a human and an animal is called a human–animal hybrid, while an organism that contains a mixture of human and non-human cells would be a human-animal chimera.
Artiodactyls, like impalas and giraffes, live in groups. The social behavior of even-toed ungulates varies from species to species. Generally, there is a tendency to merge into larger groups, but some live alone or in pairs. Species living in groups often have a hierarchy, both among males and females.
Dorsum of human embryo, 2.11 mm in length. (The older term primitive segments is used to identify the somites.) The somites (outdated term: primitive segments) are a set of bilaterally paired blocks of paraxial mesoderm that form in the embryonic stage of somitogenesis, along the head-to-tail axis in segmented animals.