Who helped to bravely block the passage between the mountains of Thermopylae for 3 days before eventually being destroyed by the Persian army? (make sure you say which city-state he was from)

According to subpart d, research with children may be eligible for exemption when: the children will be asked to complete a surveythe research involves the use of educational teststhe children will be interviewed by the researcher. the research with children will involve participant observation with researcher interaction.