Am nevoie de ajutor la punctul a cine stie

Miguel is making an obstacle course for field day.at the end of every sixth of the course,there is a tire .at the end of every third of the course,there is a hurdle.at witch locations of the course will people need to go through more than one obstacle?

During sensitive periods of brain development like cell migration the brain is vulnerable to effects like: a. malnutrition b. infection c. toxins /drug use d. b and c e. all of the above

What does this tattoo mean in english?