I think the answer is C human-enviormental interaction.
It's an example of a simile
Low levels of both endorphins and serotonin have been implicated as contributory factors in mood disorders.
This is further explained below.
<h3>What are
endorphins?</h3>
Generally, When you are in discomfort or under pressure, your body will secrete substances known as hormones called endorphins.
They are also discharged during enjoyable activities like working out, getting a massage, eating, and engaging in sexual activity.
Endorphins are neurochemicals that help alleviate pain, lower levels of tension, and promote overall feelings of well-being.
In conclusion, Both low levels of endorphins and low amounts of serotonin have been suggested as potential contributing factors in the development of mood disorders.
Read more about endorphins
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USA had to join the war after altercations and provocations by the Germans.
Explanation:
America had remained neutral for almost all of the war until their trade ships began being sunk by the Germans as USA was a major supplier of arms to the nations and then their trade routes were purposefully blocked.
There was also a plan revealed in the Zimmermann note about a conspiracy to get Mexico to declare war on the USA effectively starting a home front in the war for US.
This was what led US to get involved in the war directly.
