How does one determine the central or main idea of an information text?

According to homer's iliad, which greek god was helen of troy's father? a. apollo b. poseidon c. zeus d. hades

What are the similarities of physical and chemical change ?

Ead this sentence from the evolution of useful things.the underlined phrases indicateaaking waterproof sandpaper would allow wet sanding,which in turn would cut down on dust, and thus be a greatmprovementpassing of timea directional change of positiona cause-and-effect relationshipsequence of events.save and exitmark this and retur