Answer:
They test or measure something.
Explanation:
Primary research articles report on research that has been completed. Therefore, a primary research article will review and analyze studies, and will state the research question and hypotheses of the studies presented. A primary research article does not test or measure anything, but will report on studies that do.
Answer:
The reason our heart wont just stop working is because it's the main muscle that is working everything else in your body and your other organs would have to stop before your heart would come to a stop. because even if someone or something dies their heart will not stop immediately their heart will go to a slower pace and then stop
Graphite is well known to be pencil lead - You might actually learn this in Chemistry/Physical Science like we did!
Charcoal & coal you cannot use - you could but it'd be difficult and irritating.
Fullerene is the third form of carbon. It can be used for electronics AND medicine. Amazing right??
D i believe is the correct answer if i remember from my biology class