PLZ HELP ME I NEED TO FINISH THIS TO GO TO BED

Which pattern most likely came from a gunshot and which one was produced from a blow on the head? explain your answer?

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.

Which part of cellular respiration must occur before any of the other steps can occur