Examlex
Electrical stimulation of which of the following structures has analgesic effects?
Biogeochemical Cycles
These are natural pathways by which essential elements of living matter are circulated through the biotic (living) and abiotic (non-living) components of the Earth.
Nonbiological Reservoirs
Environments or materials that can harbor or transmit disease-causing organisms without having biological functions themselves.
Aquifers
Underground layers of water-bearing rock or materials that can yield water for use.
Guano
The accumulated excrement of seabirds or bats, used historically as a highly effective fertilizer because of its high nitrogen, phosphate, and potassium content.
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