Which of the following statements about iron filings placed upon glass resting on top of a bar magnet is false?

a. the direction of the flux in the portion of a magnetic field outlined by the filings will be from the north pole of the magnet to the south pole.
b. the filings will sit on the glass on curved paths between the north and south poles.
c. the density of the filings will match the intensity of the magnetic field.
d. the filings will be clustered more densely where the field is weakest.

Statements  A,  B,  and  C  are true.

Statement D  is false.

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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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