- المجال: Government
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NOAA Coral Reef Conservation Program, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
In taxonomy, a name which, under the provisions of the International Code of Zoological Nomenclature, cannot be used as a valid name and which is set aside in favor of another name.
Industry:Natural environment
One of the bony segments of the vertebral column of vertebrate animals; in brittlestars (Echinodermata-Ophiuroidea), a vertebra is one of the many articulated ossicles that join together along the length of the arms. They occupy most of the interior of each arm, and have sockets by which they connect to each other .
Industry:Natural environment
The degree to which a characteristic helps an organism to survive and reproduce, or affords greater fitness in its environment.
Industry:Natural environment
The study of the interrelationships between organisms and their environment, including the biotic and abiotic components.
Industry:Natural environment
A breathing gas mixture for scuba divers that contains only oxygen and helium, used for deep diving to remove the narcotic effect of nitrogen.
Industry:Natural environment
A double stranded DNA (the double helix) always has an orientation or directionality. Because of this directionality, the nucleotides along one strand are heading in one direction (e.g. The 'ascending strand') and the others are heading the other (e.g. The 'descending strand'). For reasons of chemical nomenclature, the asymmetric termini of each strand are called the 5' and 3' ends (pronounced "five prime" and "three prime"). Nucleotide sequences are read by enzymes in the "5' to 3' direction". In a vertically oriented double helix, the 3' strand is said to be ascending while the 5' strand is said to be descending.
Industry:Natural environment
A little differentiated species evolved from a close common ancestor; a "twin" species. For example, pairs on either side of the Isthmus of Panama who are each other's closest relative and were probably one species before the sea level dropped.
Industry:Natural environment
A polyp that develops asexually on the skeletons of some coral species.
Industry:Natural environment
