Answer:
Because this is a disease that has the ability to kill many people at once.
Explanation:
According to the text shown in the question above, we can see that the disease known as the Spanish Flu is very dangerous and can kill a very large number of people in a short period of time. This information can be confirmed by several articles and scientific and historical sources, which show how this disease has a devastating potential. This ability to kill is what causes this disease to receive so much attention from both historians and scientists, who need to document and look for ways to protect the world's population from this disease.
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Gratitude is an essential feeling for our tranquility and happiness. That's because when we are grateful for something it means that a good and prosperous element has been added to our lives, making us happier.
My biggest memory with this feeling happened a few years ago, when my family was going through a lot of financial problems and the situation at my house was not good. We were all very stressed, but happy to be able to count on each other. At that time I had been looking for a job across the city and I couldn't get a call for any of them. I was very sad and my mental health was very shaken because I did not see the solution to my problem.
However, after a long wait, I managed to find a job. This was such a good time in my life that I felt the fullest gratitude I had ever felt before. The job, even if it paid me little, would allow me to help my family and still help me to calm my mind.
That way I was able to understand exactly what gratitude was and realized that we don't need great things to happen in order to be grateful, but we can be grateful for small things that positively impact our lives very strongly.
A subordinate idea in the sentence is the part of the sentence that does not convey a complete idea or thought and needs the main sentence to complete its message. The subordinate idea in the given sentence above is "After we found the classroom". This is introduced by the subordinating conjunction "after".