During exercise, the oxygen concentration in the blood increases to twice that of resting levels. select the best answer from the choices provided. t f

The cardiovascular system, which transports blood through the body, is a one-way system. select the best answer from the choices provided. t f

Calvin is a 12-year-old boy. due to pressure from his friends, he has started consuming certain toxic materials that are addictive and harmful. calvin is a victim of what type of abuse? a. sexual b. substance c. physical d. emotional

Which safe and legal options do teen parents have if they think they are not ready to be parents? check all that apply. leave the baby in front of someone's door. surrender the baby under their state's safe-haven laws. place the baby for adoption. release custody to the baby's grandparents. give the baby to a stranger.