A little bit less than a purposely discovery. A discovery that you've been looking for for a while would be like 75% of discovering but accidentally would be 35% of actually discovering something accidentally.
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Below are the choices that can be found elsewhere:
<span>semi-truck – it has more inertia
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semi-truck – it has balanced forces
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small car – it has more inertia
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<span>small car – it has balanced forces
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The answer is "<span>semi-truck – it has more inertia"</span>
One explanation could be the differences in climate (environmental factors). The climate in northern Mexico could support the reproduction of the mosquito species, which is a vector of the dengue virus. Other environmental conditions that influence its endemicity could include living conditions and sanitation. The other possiblity could be that the people in the US have developed immunity for the disease, therefore, are unaffected even when infected by the virus.