Astudent explains the nebular theory of formation of the solar system as follows. "the solar system was formed from a slowly rotating cloud called nebula containing extremely cold gases. when these gases were heated up, the nebula contracted and became a flattened disk. as the nebula became smaller, it rotated more rapidly and became flattened at the poles. gravitational force caused rings of gases to be left behind when the nebula contracted. at the center of the nebula, the gases combined to form the sun and the planets formed in the outer flattened portion of the disk." what is the flaw in the student's explanation? (1 point) a. gravitational forces did not the nebula to contract b. the nebula consisted of hot gases which contracted on being cooled c. the speed of rotation of the nebula decreased when it became smaller d. planets were formed in the central core of the nebula instead of outer portion of disk

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.

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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