According to the context the term that adequately completes the fragment is Herd immunity.
<h3>What is herd immunity?</h3>
Herd immunity is a term to refer to a biostatistical phenomenon that originates in a population when most of it has become immune to a disease (due to previous infection or because it has been vaccinated) and the epidemiological chain is interrupted, causing an indirect form of protection against a disease by preventing unimmunized individuals from becoming infected.
According to the above, the appropriate term to complete the fragment would be herd immunity.
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Hope this is the right Calderon your talking about lol.
Calderón served as National President of the party, Federal Deputy, and Secretary of Energy in Vicente Fox's cabinet. He served in the cabinet of the previous administration until he resigned to run for the presidency and secured his party's nomination.
Showed a lot of respect to others & other people
Explanation:
C .Eurpeans wanted to spread Muslim beliefs throughout the continent of Africa