Which of the following describes RNA -RNA is usually single-stranded and contains uracil
-RNA is made and carries out its functions in the nucleus
-RNA is usually double stranded in contains thymine
-RNA is longer and contains five bases

RNA is usually single stranded and contains uracil

Explanation:

DNA is the one which is double stranded (has a helical structure) and it has the nucleotide bases; Adenine, Thymine, Cytosine and Guanine whilst RNA is single stranded and does not form a double helix like DNA. RNA also has the same nucleotide bases but instead of having Thymine it has Uracil.

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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.