What rock was formed from tiny grains of calcite precipitated from sea or lake waters and has been altered by high pressure?

What is the correct trna sequence that would match the following mrna sequence. gcgaua

Which statement best describes how the loudness of the sound affects the high-pressure region created by the sound wave? a. a louder sound has no effect on the pressure created. b. a louder sound means a high-pressure region that is higher. c. a louder sound means a high-pressure region that is not as high.

Which of these is not a nucleotide base found in dna?