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Answer: have
Dr. Robert Fogel at the University of Chicago and other scientists around the world have concluded that a significant change in people’s physical size has taken place.
Explanation:
When the verbs "have" and "has" are connected with past participles, such as "concluded", they create a sentence in the present perfect verb tense, which is used to describe ongoing situations that happened in the past and remain in the present. "Have" applies to the pronouns "I, "you", "we", and "they", while "has" applies to the pronouns "he", "she", and "it".
He was brought then gradually back to his old ideas. Greek like struggles would be no more. Men were better, or more timid. It celebrates military might.
