When an object rests on a surface, such as a table, for example, the downward force it applies to the surface is counteracted by an equal but upwards force, or reaction, applied by the surface. See more at Newton's laws of motion. A response to a stimulus, such as a reflex.
Background. The northern snakehead fish (Channa argus) has been identified as an invasive aquatic fish across the country. Snakehead fish got their name because of their long, cylindrical body plan and large scales on their head that give them a snake-like appearance.
1 Asian carp are a type of fish native to Asia that have been introduced or could be introduced in the United States. 2  Asian carp are regarded as highly invasive species in the U.S. capable of causing economic, ecological or human health harm. 3  They include the flowing species: