Answer:
Shouldn't you know why yo're taking the course? Others can't answer for you.
Explanation:
I think scientists are so interested with our brains, because our brain could be considered the most powerful thing ever, everything man-made was from our brain. Our brain can literally scare itself to death. I think they are so interested because it is so powerful.
Answer:
The answer is option 2 , that is, they analyze blood samples
