After years of hard work and rigorous research, carol completed her phd in microbiology. she posted the news of her achievement on facebook, and a number of her friends left congratulatory messages on her facebook wall. carol's post and her friends' comments are an example of

The persian wars started when emperor darius i began an invasion of greece. what caused darius to decide to attack greece? a. greek pirates had raided persia's merchant ships and coastal towns. b. greek armies had attacked and taken over land that belonged to persia. c. greek city-states had supported rebellions in the persian empire. d. greek leaders had declared independence from the persian empire.