The answer would be C, "The earth is heated by terrestrial radiation."
Terrestrial radiation is a factor in what heats up the earth and it's a major factor in the study of global warming.
DNA and RNA both contain a cyclic nitrogenous base, a posphate group and a five-carbon sugar. These are the base units of nucleotides which make up nucleic acids. DNA contains the nitrogenous bases; adenine, thymine, cytosine and guanine wheresas RNA contains the bases; adenine, thymine, cytosine and urasil. DNA codes for the nucleotides in an RNA molecule, whereas DNA codes for the amino acid sequence in a protein
C) no till farming I believe is the correct answer
The source of the oxygen released into the air as a product of photosynthesis is C) Water only.