Because it is polar and it is to large to cross the membrane and because the concentration gradients are to strong so they have to be diffused.
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The central element for all living things is carbon, which is why you might often hear the phrase "carbon-based" lifeforms. Another term is often "organic matter"
<span>Molten material found in the bottom of seafloors indicated underwater eruptions that formed new areas of the seafloor was presented as evidence for seafloor spreading. Due to earths magnetic polarity and its tendency to switch, iron present on the sea floor contained a magnetic record of sea floor expansion progress. Finally, drilling samples obtained in the seafloor indicated the deeper samples of were significantly older than the shallower samples that were brought up.</span>
Answer is in a photo. I couldn't attach it here, but I uploaded it to a file hosting. link below! Good Luck!
<span>B:Areas of equal pressure</span>
