Which word comes from a Greek root meaning star

In which two sentences does the author use an ironic tone toward the subject

Why it's time to lay the stereotype of the 'teen brain’ to rest 1. part a: which statement identifies the central idea of the text? a experts have spent time researching how different the teenage brain is from adults’ brains, when they are actually more similar than different. b teenagers often engage in risky behavior to fulfill the narrative they have been told about how teenagers are supposed to behave. c explanations for why teenagers engage in risky behavior have been overly focused on brain development, rather than their natural need to explore the world. d teenagers’ risky behavior is influenced by the combined effects of their hormone levels and their brain development.

Which word in the sentence is a direct object? have you read your brother and sister their favorite books? a. you b. brother c. books d. sister