Which statement about the pyloric sphincter is true?

a. when the pyloric sphincter opens, partially digested food is pushed from the esophagus into the stomach.

b. when the pyloric sphincter opens, partially digested food is pushed from the stomach to the large intestine.

c. when the pyloric sphincter closes, partially digested food is prevented from entering the large intestine.

d. when the pyloric sphincter closes, partially digested food is prevented from entering the small intestine.

What did the first language sound like

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.

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a.one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b.one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c.one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.