Neuroimaging or brain imaging is the use of various techniques to either directly or indirectly image the structure, function/pharmacology of the nervous system. It is a relatively new discipline within medicine, neuroscience, and psychology.
Answer: [D]: "oceans" .
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Note: Among the answer choices given—{aquifers, glaciers, lakes, oceans}—oceans are the saltiest (VERY salty—requiring "desalination" in order to obtain potable water.
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Option C. Organisms were probably more complex during past eras.
Habitat loss..The most harmful threat to biodiversity is the D. Habitat loss.
It's not easy to live in a place that you no longer have any means of living. If ones organism loss his habitat, chances are they will extinct because of the absence of their basic needs.
