The answer is the second one b
Answer:
3: A device that uses radioactive fluid to determine the active areas of the brain
Explanation:
A positron emission tomography (PET) scan is an imaging test that helps reveal how your tissues and organs are functioning. A PET scan uses a radioactive drug (tracer) to show this activity. This scan can sometimes detect disease before it shows up on other imaging tests.
Depending on the type of exam, the radiotracer is injected, swallowed or inhaled as a gas. It eventually accumulates in the area of the body under examination. A special camera or imaging device detects radioactive emissions from the radiotracer. The camera or device produces pictures and provides molecular information.
<span>This occurs when the cytoplasm is replaced by hard keratin over time as the skin changes, this is what results in the scale like patterns that are observed.</span>
<span>Diffusion
is the movement of particles from a high to low particle concentration,
while osmosis is the movement of water from a high to a low water
concentration.
</span>
It's actually really simple:
1) Diffusion simply means liquid or gas particles spreading out. They spread out from the area where most of the particles are orginally located. In other words they thus spread out from a HIGH CONCENTRATION area to a LOW CONCENTRATION area. 2) Osmosis is LITERALLY just DIFFUSION OF WATER. HOWEVER, you MUST use the word 'osmosis' when referencing such diffusion of water.
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