Toleration is the recognition of the rights of an individual to his or her own opinions and customs
The United States feared that if communism was successful on Vietnam, the rest of the countries that border it would soon turn into communism and those other countries that border that new communist country would also be converted to communism and so on. This is called the "domino theory" and made the United States to send troops to prevent the theory from happening.
<span>Assuming that this is referring to the same list of options that was posted before with this question, the most likely to survive would be any create that is able to blend in (assimilate) into their environment, which leads to a lack of detection relative to others. </span>
