((What information does the geologic time scale provide?))) 1.) explanation of how Earth formed
2.) places where dinosaurs roamed on Earth
3.) reasons why organisms evolve into different species
4.) information about when plants first appeared

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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