Explain why an astronaut, after 3 weeks in space, might experience fatigue and weakness for a short time upon returning to earth. you should focus on blood pressure in your answer.

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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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.