Answer:
Experiment
Explanation:
An experiment is conducted to test the activity of the caffeine in the blood stream of the athlete
Cell differentiation<span> is how generic embryonic </span>cells <span>become specialized </span>cells<span>. This occurs through a process called gene expression. Gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a </span>cell<span> functions.
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.Edu is probably the most reliable source because this means the site has valid information.