The noble gases in group 18 were some of the last natural elements to be discovered. construct an explanations to why this is so. please help i have to have this done by tomorrow or my teacher is going to my mom and tell her that i did not turn my assignments in an and i will get it troubble so please ahis question

What would happen to the nutrients in an ecosystem if decomposers, such as bacteria, didn’t exist there?

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.

World class speed skaters can skate a 3,000-m course in about 4 minutes. what is their average speed for this course. a. 12.5m/s b. 1.33m/s c. 13.3m/s d. 1.25m/s