Evidence that a gas consists mostly of empty space is the fact that: (a) the density of a gas becomes much greater when it is liquefied (b) gases exert pressure on the walls of their containers (c) gases are transparent (d) heating a gas increases the molecular motion (e) nature abhors a vacuum

(A) the density of a gas becomes much greater when it is liquefied

Explanation:

The gaseous state is composed of mainly empty space , therefore , the density of the gas increases as it goes to the liquid phase .

As , in the liquid state , the molecules are close together , there by increasing the density of the liquid state .

There fore , from the options , the most appropriate is option a.

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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3. dark matter

empty space could also be a simple vacuum