Students analyzed four biological samples that each contained a different type of macromolecule. the table shows the results of their analysis. based on this data, which sample most likely contained rna?
sample 1
sample 2
sample 3
sample 4

Four types of motile cells in human body?

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.

How does natural selection change thephenotypes within a population over time?