Nitrogen (N2 ) is
A) a key component of life, integrated into our bodies directly from the air.
B) a product of the radioactive decay of a form of potassium in the crust.
C) cycled through the environment via the activity of bacteria.
D) now measured at 20.946% by volume in the homosphere.
C
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Which of the following statements regarding transcription and translation is true?
A. mRNA includes the bases A, C, G, and T. B. A codon consists of a sequence of two nucleotides. C. A tRNA molecule includes a codon sequence and carries a single amino acid. D. An RNA transcript may contain sections that are removed before translation.
Explain why the Mesosaurus was a good example to support Wegener's ideas
What will be an ideal response?
The metamorphic equivalent of limestone is
A. quartzite. B. schist. C. marble. D. gneiss.
Most of the world's glacial ice is located in ____
a. Alaska b. Iceland c. Antarctica d. Greenland