Esther is experiencing lower back pain after lifting tools and materials all day at her worksite. what type of hazard is most likely to have caused her symptom?
select the best option.

ergonomic

physical

biological

chemical

Karen is waiting by the lockers before school for her friend richard. they had agreed to look over the history review sheet together to be ready for the test later that day. richard shows up late with uncombed hair and wrinkled clothes. karen: "you're five minutes late and you look like a wreck! " richard: (slams his locker) "you know, i don't have time for this." karen: "fine! figure out the test on your own! "