PLEASE DO THIS WITH YOUR OWN WORDS 20 POINTS Explain how Earth's atmosphere has changed over time.

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 image shows labeled organelles that are present only in plant cells?

In the water cycle , when does water undergo a chemical change