Answer:
E. It takes a picture of the brain according to oxygen levels. More oxygen in an area indicates more activity in that area.
Explanation:
Haemoglobin is diamagnetic when oxygenated but paramagnetic when deoxygenated. This distinction in magnetic characteristics leads to tiny variations in the blood MR signal. Since blood oxygenation differs, these variations can be used to identify brain activity depending on the concentrations of neural activity.
Naturally it will be very unstable. Likely cause bad weather or such
Answer:
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Because it is polar and it is to large to cross the membrane and because the concentration gradients are to strong so they have to be diffused.
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