- 行业: Government
- Number of terms: 30456
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NOAA Coral Reef Conservation Program, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
The regular recurrence, in cycles of about 24 hours, of biological processes or activities.
Industry:Natural environment
Toward the source or upper part of a stream or current; against the current.
Industry:Natural environment
A concept of species in which a species is a set of organisms that are phenotypically similar to one another.
Industry:Natural environment
A group of individuals of the same species living in the same area at the same time and sharing a common gene pool; a group of potentially interbreeding organisms in a geographic area.
Industry:Natural environment
A movement of air or water caused by changes in density or thermal gradients.
Industry:Natural environment
A sea floor fissure from which a spring of geothermally heated mineral and gas rich seawater issues. Hydrothermal vents are found on some oceanic ridges in zones of active seafloor spreading (plate tectonics) .
Industry:Natural environment
A taxon including several subordinate taxa, e.g. A polytypic genus is one containing several species.
Industry:Natural environment
An undifferentiated cell of a cleaving embryo, and of the morula and blastula stages of embryonic development.
Industry:Natural environment
