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.
Channa argus. The northern snakehead is a predatory fish native to southern and eastern Asia that is now found in several American states. The fish was likely introduced to the United States by people who bought live snakehead from fish markets or pet shops and later released them into lakes, rivers or ponds.hanna argus. The northern snakehead is a predatory fish native to southern and eastern Asia that is now found in several American states. The fish was likely introduced to the United States by people who bought live snakehead from fish markets or pet shops and later released them into lakes, rivers or ponds.