Sarah has been eating and sleeping poorly. she was just diagnosed with pneumonia. tests showed the illness was caused by streptococcus pneumoniae. in the chain of transmission, sarah is the , and streptococcus pneumonia is the .

Emma recently found out she was pregnant.every thursday evening for the next six weeks, emma and her mother will attend a special program that prepares pregnant teens to become mothers.during the first class, emma learned about the stages of childbirth.what was the order she was taught? first, emma learned about  .then, she learned about the    stage.next, emma learned about  .last, she learned about the    stage