Hippocampal activation is a strong predictor of whether someone will develop full-blown schizophrenia

Which of the following statements about the passive voice is correct?

a. A sentence using the passive voice typically has a very different meaning than a sentence using the active voice. b. We use the passive voice and the active voice equally often in English. c. People understand a sentence more quickly if the sentence is active, rather than passive. d. Writing manuals often encourage scientists to write in the passive voice in order to appear more scholarly.

Melatonin helps to keep the biological clock in phase with ________

a. fluctuating hormone levels. b. the waning light of winter. c. seasonal fluctuations. d. the light-dark cycle.