A colossal squid is considered by many scientists to be the largest invertebrate on Earth. A male colossal squid measures up to 14.0 m in length and can have a mass of 680 kg. That's longer than a greyhound bus! These large animals prefer the cool, nutrient-rich waters off the coast of Antarctica. These squids live at an average depth of 1000 m
below the ocean's surface, where tre gauge pressure measures 1.0. 10° Pa (ten million Pascals) and the density of seawater is 1033 (kilograms per meter cubed).
Calculate the gauge pressure (in Pascals) that a colossal squid must be able to withstand when it swims to a depth of 1.40 - 106 Gm (gigameters) to search for food
(remember the acceleration due to gravity near Earth's surface, g = 9.81 7).

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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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