The deficiency of growth hormone during bone formation would cause a decreased proliferation of the epiphyseal plate cartilage. Growth hormone is a peptide hormone secreted by the pituitary gland under the control of the hypothalamus. It directly through IGF-I stimulates osteoblasts proliferation and activity, promoting bone formation. In addition it also stimulates osteoclast differentiation and activity, promoting bone resorption. Therefore, growth hormone is an important hormone in bone formation.
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Margulis theorized that eukaryotic cells (cells with nuclei) evolved from a symbiosis of bacteria without nuclei that had previously lived independently. ... This serial endosymbiotic theory, or SET, gave a new view of evolution and helped explain the origin of cells with nuclei.21-Oct-2008
Works written: Origin of Eukaryotic Cells, Symbiosis in Cell Evolution, Microcosmos ...
Professions: biologist, scientists
Spouse: Carl Sagan
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The temperatures are so cold that there is a layer of permanently frozen ground below the surface, called permafrost. This permafrost is a defining characteristic of the tundra biome. Mosses, sedges, and lichens are common, while few trees grow in the tundra.
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Heterotrophs compete for the same food source.
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<span>A fast-flowing river of air that forms when two air masses of very different temperatures meet is called B. jet stream.
These types of streams are often meandering, and can be found on some planets, not only the Earth.
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