____ eliminates background static during pauses in a transmission, essentially muting the radio between transmissions and thereby improving the message's overall quality.

Active range of motion is:

a. the best for maintaining joint motion. b. for strengthening muscles. c. increasing ROM at the joints moved. d. performed under supervision of the PT/PTA to ensure correct performance.

Digital signals are also used in some kinds of paging and tone-alerting systems because they transmit __________ and allow for more choices and flexibility.

a. numerically b. faster c. alphanumerically d. encoded messages