The _____ system activates the body's "fight or flight" response.

Amniocentesis is administered

A. in the second trimester to all pregnant women who seek medical attention B. only when the mother is at a high risk for giving birth to a child with abnormalities C. as a nonintrusive test by placing a small transmitter on the abdomen of the pregnant woman D. as a safe test with no injection or pain to the mother or potential damage to the fetus

When all the frequencies of the sound spectrum occur, they produce a hissing sound called _______________

a. frequency. b. timbre. c. white noise. d. tonal quality.