- 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
A pair of resources for which consumption by the consumer of one resource reduces its requirement for the other.
Industry:Natural environment
A small antenna, especially the first pair of antennae in crustaceans.
Industry:Natural environment
A tooth-bearing structure found in most mollusks, except bivalves. It consists of several muscles and a cartilage which support the radula and radula sac; the term is also applied to the radula alone.
Industry:Natural environment
An atom or group of atoms possessing an unpaired electron; free radicals are highly reactive and bind with other molecules, thus disrupting normal cellular processes and causing cellular damage (oxidative stress).
Industry:Natural environment
Any of various branchiopod crustaceans having swimming and respiratory appendages that resemble leaves.
Industry:Natural environment
During embryonic development of most animals, a complex and coordinated series of cellular movements occurs at the end of cleavage. The details of these movements vary among species, but usually result in the formation of of an embryonic stage termed the gastrula. The gastrula has two primary germ layers, the ectoderm and endoderm in diploblastic animals, and three primary germ layers with the development of the mesoderm in triploblastic animals.
Industry:Natural environment
In scyphozoans (jellyfish), one of four sacs is which food in digested. Each pouch contains a conspicuous horseshoe-shaped gonad on its floor.
Industry:Natural environment
Nostril; an opening, external and internal, of the nasal passage. Nares (pl) in fishes lead to blind olfactory sacs and do not connect with an internal passageway. There is an incurrent aperture and an excurrent aperture. Movement of water into the olfactory sacs is for smelling rather than respiration.
Industry:Natural environment
The chemical changes that transformed simple atoms and molecules into the more complex chemicals needed for the origin of life.
Industry:Natural environment
