- المجال: Government
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NOAA Coral Reef Conservation Program, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
Tissue in vascular plants that carries water and nutrients from the roots to the shoot and leaves. The xylem contains tracheids, vessels, fiber cells and parenchyma. It also provides structural support.
Industry:Natural environment
The Crown-of-Thorns starfish genus. Acanthaster planci is a voracious Indo-Pacific predator of corals.
Industry:Natural environment
A colorless chromatophore which contains purines, usually guanine, in the form of small, motile crystals in the cell's cytoplasm.
Industry:Natural environment
A giant protozoan protist (Syringammina fragilissima), up to 25 cm in diameter, that inhabits deep-sea habitats. Large aggregations of xenophyophores appear on the Darwin Mounds.
Industry:Natural environment
A model of evolution that assumes slow, steady rates of change, as contrasted with punctuated equilibrium, an evolutionary model in which change occurs in relatively rapid bursts.
Industry:Natural environment
A rock formed by the cooling and crystallization of molten magma.
Industry:Natural environment
An aggregate of colloidal droplets held together by electrostatic forces. Coacervate droplets may contain a mixture of organic compounds. One theory of the evolution of life is that the formation of coacervates in the primeval soup was a step towards the development of cells.
Industry:Natural environment
An organism which lives in an environment of high salt concentration. Halophiles have special adaptations to permit them to survive under these conditions.
Industry:Natural environment
Contact with infectious agents such as bacteria or viruses in a manner that promotes transmission and increases the likelihood of disease.
Industry:Natural environment
