Tonic receptors:.
A) slowly decrease the frequency of action potentials generated to a constant stimulus.
B) are quick to adapt to a particular stimulus intensity.
C) will always decrease to the point where no action potentials are generated.
D) are attune to changes in a parameter, not the extent of that change.

A) slowly decrease the frequency of action potentials generated to a constant stimulus.

Explanation:

Tonic receptors slowly decrease the frequency of action potentials generated to a constant stimulus. These receptors are also called sensory receptor as they continue to produce action potentials over the duration of the stimulus.  Some of the tonic receptors are permanently active.

loess contribute to the flooding of rivers by providing the silt that is washed into rivers and constantly raises the bed of the rivers. this elevation above the surrounding flood plains and dams allow the river to overwhelm the dams and flood thousand of square miles of neighboring flood plains.

answer would be b, a tariffs main purpose is to protect domestic production and jobs.