Answer:
Dedicate
Step-by-step explanation:
Out of the options provided, the word "dedicate" is the one that most closely relates to the word "scientists." In this passage, the author talks about several subjects, such as yawns, science and knowledge. In the fourth sentence, he begins by saying that "scientists dedicate their lives to knowledge..." This shows that the author considers scientists to be dedicated and committed to science and the pursuit of knowledge.