- Industry: Government
- Number of terms: 30456
- Number of blossaries: 0
- Company Profile:
NOAA Coral Reef Conservation Program, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
A principal male steroid hormone, such as testosterone, which stimulates the development and maintenance of the male reproductive system and secondary male sexual characteristics.
Industry:Natural environment
SONAR is an acronym for "sound navigation and ranging." Active sonar describes an apparatus that transmits high frequency sound waves in water and registers the vibrations reflected back from an object. Passive sonars listen without transmitting. They are usually military (although a few are scientific). Some marine animals, such as whales and dolphins, use echolocation systems similar to active sonar to locate predators and prey.
Industry:Natural environment
The distribution of organisms as revealed by the fossil record.
Industry:Natural environment
A change in the genetic composition of one species (or infraspecific group) in response to a genetic change in another, i.e. Two or more species evolving, each in response to the other.
Industry:Natural environment
A state in hermaphroditic systems characterized by the development of female reproductive organs, or maturation of their gametes, before the appearance of the corresponding male product, thus insuring against self-fertilization.
Industry:Natural environment
The thin region surrounding the Earth that is capable of supporting life.
Industry:Natural environment
A change in the shape or structure of an organism through growth and differentiation.
Industry:Natural environment
A process by which tissue deteriorates, loses functional activity, and may become converted into or replaced by other kinds of tissue; deterioration which causes some degree of loss of original function; the process of declining from a higher to a lower l.
Industry:Natural environment
A wave-resistant structure resulting from cementation processes and the skeletal construction of hermatypic corals, calcareous algae, and other calcium carbonate-secreting organisms.
Industry:Natural environment
