Producers of many mouthwash brands claim that using mouthwash prevents tooth decay. what is the best conclusion regarding these mouthwash brands and bacteria in the mouth?
a. mouthwash contains ingredients that kill harmful bacteria.
b. mouthwash contains bacteria that produce oxygen.
c. mouthwash does not really work because the growth of harmful bacteria cannot be prevented.
d. mouthwash does not really work because bacteria is not known to directly cause tooth decay.

The fauces connects which of th following structures to the oropharynx

What was dr. willem johan kolff’s first step in using the scientific process to invent the hemodialysis machine? he built the machine and tried it with various patients, collecting data about its effectiveness. when a patient’s kidneys failed, he wondered if it would be possible to perform kidney functions with an external machine. he researched and collected data about numerous patients who exhibited symptoms of kidney failure. he drew conclusions from studies of various symptoms of kidney failure, and drew a design for the ideal external blood-processing machine.

Most of the fossils found in virginia are in the coastal plain, valley, ridge, and appalachian plateau regions, best suggesting that these geographic provinces a) were once covered by seawater. b) are the oldest parts of virginia. c) have a great deal of karst topography. d) have large amounts of sedimentary rock.