What is a Stimulus?
Explained in your own words

In general, a stimulus is something that provokes or causes an action or response, as in Failing that test was the stimulus I needed to start studying harder. The plural of stimulus is stimuli. ... In the context of science, a stimulus is anything that makes an organism or a part of an organism react in some way.

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Explanation:

Something that causes a reaction in an organ or cell is called stimulus

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- "the die is cast; i have consented to return if we are not destroyed. thus are my hopes blasted by cowardice and indecision; i come back ignorant and disappointed. it requires more philosophy than i possess to bear this injustice with patience. i have lost my hopes of utility and glory; i have lost my friend."

the correct answer is d. sinking. - apex.