High school diploma is <span>correct and salary</span>
At the beginning of the 20th century, the leading cause of death in the U.S. was infectious diseases.
<h3>What are infectious diseases?</h3>
Infectious diseases are any type of disease that can be transmitted by suitable hosts and vectors, which are caused by bacteria and viruses.
Infectious diseases are well known to produce epidemics and pandemics and vaccination helped to fight against them.
Infectious diseases were the main cause of death around the world (not only in the USA), but now we are able to fight against transmissible diseases by using the latest technological advancements.
In conclusion, at the beginning of the 20th century, the leading cause of death in the U.S. was infectious diseases.
Learn more about infectious diseases here:
brainly.com/question/14083398
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Answer:
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It's due to more pressure as the sound is searched deep into the waters.<span> The adjustments were done to adapt and make clearer sounds.</span><span>
</span><span>Animal researchers use hydrophone arrays to determine the location of the whale calls. </span><span>Another equipment is the Sound Surveillance system, it is used on the sea floor once during the cold war to detect warships and submarines. But now it is used in researchers to understand animals in the ocean. </span>
