Answer:
Because atmospheric nitrogen can't be used by plants and animals. ... Why are bacteria important to the nitrogen cycle? because when bacteria converts ammonia into nitrate and nitrite, producers need them to make proteins and then consumers eat the producers and reuse the nitrogen to make their own proteins.
Explanation:
The correct answer is - A. polar.
The perpetual night appears only on the north pole and the south pole and their closest surrounding areas. This is due to the Earth's inclination which makes it possible for this phenomenon to appear, because of the way the Earth is inclined and positioned towards the Sun throughout the year we have situations when for half of the year one of the poles is not getting any sunlight, while in the other half of the year the other pole is not getting any sunlight. When one of the poles experiences perpetual night, the other experiences a perpetual day.
Most fossils are found in sedimentary rocks, those rocks produced by the accumulation of sediment such as sand or mud. Wind and other weathering conditions wash away sediment on land, depositing it in bodies of water. For this reason, fossils of sea creatures are more common than those of land creatures..
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<em><u>so answer is FOSSILS</u></em></h2><h2 />