Question

why do we feel the need to yawn when we see others yawning? the answer may be that our brains are built that way. we automatically copy people, without even thinking about it. it’s our way of being social, or friendly. experts used to think that yawning meant your brain needed oxygen. but a group of scientists proved this idea wrong. they tested the theory by having people breathe in different amounts of oxygen. scientists thought people given more oxygen would yawn a fewer number of times. but the rate of yawning stayed the same for everybody. what does the word
ate\ mean in the underlined sentence? options: different ideas that were tested; the number of times something happens; ideas that scientists proved wrong; what experts think about yawning.

Explanation:

To determine the meaning of "rate" in the sentence "But the rate of yawning stayed the same for everybody," we analyze the context. The scientists were testing how many times people yawned (yawning frequency) when given different oxygen amounts. The first option refers to tested ideas, not "rate." The third is about disproven ideas. The fourth is about experts' thoughts. The second option, "the number of times something happens," matches the context of how often yawning occurred.

Answer:

the number of times something happens