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.
<h2>Answer:</h2>
Soil bacteria are mainly involved in four steps in nitrogen cycle.
- Nitrogen fixation
- Nitrification
- Ammonification
- Denitrification
<h3>Explanation:</h3>
- First of all atmospheric nitrogen is fixed by soil bacteria (N2 to NH3/ NH4+, NO3-)
- Nitrification: The conversion of ammonium to nitrate is performed primarily by soil-living bacteria and other nitrifying bacteria (NH3 to NO3-)
- When a plant or animal dies or an animal expels waste, the initial form of nitrogen is organic. Bacteria or fungi convert the organic nitrogen within the remains back into ammonium (NH+4), a process called ammonification.
- Denitrification is the reduction of nitrates back into nitrogen gas (N2), completing the nitrogen cycle. This process is performed by bacterial species such as Pseudomonas and Clostridium in anaerobic conditions.
The answer is true light is one of the forms of electromagnetic energy.
Mediation is the process of two conflicting groups coming
together to find a middle term. It is at times the negotiation with the difference
and it is normally supervised by a person in authority who oversees and leads
the processes. If the mediation fails
them the conflict is placed under arbitration.
The process of arbitration is fully directed by an arbitrator who has
same powers as the judge but is limited to the conflict that is being solved. The
arbitrator is there to impose a final decision or come up with the resolution to
the conflict in the fairest way. He should follow justice after listening to
both conflicting side. The arbitrator is not there to find the middle term to
be agreed by the two sides.
