Final answer:
In biology, decreasing the stimulus can include lowering the frequency or volume when speaking, or adjusting a control mechanism to increase or decrease a stimulus.
Step-by-step explanation:
Decreasing the stimulus in biology can refer to a few different mechanisms. For example, when speaking to someone, decreasing the stimulus could involve lowering the frequency at which you are speaking, which refers to the amplitude. Alternatively, it could involve lowering the volume at which you are speaking, which refers to the frequency. Another example is when a control mechanism increases or decreases a stimulus. These mechanisms can either amplify a response or increase/decrease a stimulus depending on the situation.