Esperanza is having a prenatal test to remove a small sample of the placenta for genetic testing. identify the test that her doctor is performing.

The correct answer is chorionic villus sampling.  

Chorionic villus sampling is a kind of prenatal diagnosis to find the genetic or chromosomal disorders in the fetus. The transcervical method is done by administering a thin plastic tube via the cervix and vagina to reach the placenta. A small sample of chorionic villus tissue is then withdrawn.  

The chorionic villi are the projections of placental tissue, which share the genetic makeup of the baby. The chorionic villus sampling is generally done between the weeks 10 and 13 of pregnancy.  

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.