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.
State. Aquatic Invasive Species: Snakehead (PDF | 201 KB). Indiana Department of Natural Resources. Northern Snakehead. Maryland Department of Natural Resources. Northern Snakehead Fish (Channa argus). New York Department of Environmental Conservation.
First, the U.S. Fish and Wildlife Service listed the Burmese python, yellow anaconda, and Northern and Southern African pythons as injurious invasive species under the Lacey Act, making it a federal crime to import the non-native snakes or transport them across state lines.