The best answer would be: Ethnicity
Answer:
The right answer is D.
Explanation:
The lure of getting free land or inexpensive lands plus government policies to encourage settlement and colonization, provided a powerful stimulus to migration to the West along the 19th century in the United States, both before and after the Mexican-American War of 1846-1848.
The type of wave which needs a medium to travel are sound waves because they travel by oscillating electromagnetic fields
<h3>What is a Sound Wave?</h3>
This refers to the waves of refraction which is propagated by a plastic medium.
With this in mind, we can see that mechanical waves are the types of wave that needs a medium for propagation and a sound wave is an example of a mechanical wave because it travels by oscillating electromagnetic fields.
Read more about mechanical waves here:
brainly.com/question/9242091
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As being a brass instrument player, I can answer this easily. Some similarities are they are made of brass (of course). They all take air to play. You also have to buzz your lips into a mouthpiece that only brass instruments have. Some differences are they are different sizes. Different instruments take more or less air to play.
