Select true or false for the sentences that accurately describe a comet

1. they travel in orbits with a shape similar to the planets of the solar system

2. comets form when pieces of a planet or moon break off

What are chlorofluorocarbons made of

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.

You see a white marker with an orange circle and black lettering. what does this marker tell you