Which substance is most easily grounded?

a. pvc pipe
b. iron nail
c. plastic foam plate
d. rubber tire

The reference point in an electrical circuit to measure voltages is called Earth or Ground; that point is a direct hookup to earth that helps stabilizing electrical currents to prevent high voltage surges.

What makes a substance easily grounded is to be a good energy conductor; metallic objects are generally good energy conductors aka GEM "Ground Enhancement Materials" and they are mostly produced from rocks and minerals. That's why the answer is (B.) Iron Nail.

Explanation:

bacteria that live on the ocean floor are sustained by phytoplankton. phytoplankton, microscopic marine photosynthetic organisms, have a vastly significant role to play not only in the marine food web of which they’re part of, but also on a more global scale. despite their infinitely small size in comparison to other marine organisms, these tiny creatures occupy an immensely important ecological niche: they are the foundation of the marine food web, and as primary producers, play key roles in supporting all other organisms in the marine environment, as well as in the regulation of the earth’s climate through the sequestration of carbon, oxygen production, and other related processes. phytoplankton account for roughly half of all global primary productivity; therefore, their significance extends far beyond the marine environment alone. there is an intriguing sense of irony in the realization that these tiny living beings that often live out their existence unnoticed and undetected by the rest of the world, have such a far-reaching impact on the lives of virtually all other living organisms on the planet, particularly on those in the marine environment. the world that we have become accustomed to has been and is continuously shaped by the workings of these miniscule yet vital “plants of the sea”.

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