What does the presence of new rock near an oceanic ridge indicate? A. There is always a deep-sea trench underneath.
B. There is evidence of seafloor spreading.
C. They are made from oceanic crust.
D. They have iron oriented in different directions.

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the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.

a compound light microscope is used to magnify objects in steps.  

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