From where do most experts think that the influenza virus of 1918-1919 originated, and how was it passed to humans?

virus originated in China, and later humans passed it to pigs near Fort Riley, KS. Inside the swine, the virus probably mutated into its more deadly form before being reintroduced to the American population.

Explanation:

seeing as no choices were provided, i'll do my best to answer it from knowledge.

job specialization promotes work ethic to the person doing the job. he/she may be strong in the arms and able to lift things, specializing him/her in a job where you lift and carry.

d) the lindbergh baby kidnapping

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