How can you observe the law of conservation of energy in action at the skate park?

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 of the following is a macronutrient? carbohydrates lipids amino acids all of the above

Paint and solvents pose no potential hazard to human health. select the best answer from the choices provided t f