What can be found in a hair papilla?
keratin
blood vessels
touch receptors
sebaceous glands

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.

What would happen if the tubing with the yellow band was placed in a beaker of distilled water?

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above