How are cellular respiration and photosynthesis almost opposite processes? question 28 options:
a. photosynthesis releases energy, and cellular respiration stores energy.
b. photosynthesis removes carbon dioxide from the atmosphere, and cellular respiration puts it back.
c. photosynthesis removes oxygen from the atmosphere, and cellular respiration puts it back.
d. all of the above

According to the rna world hypothesis, rna acted as the genetic material and catalyzed reactions in ancient cells. what conclusion can you draw from this?               a.  this implies that dna and proteins aren't essential in cells today.    b.  this implies that rna can catalyze any chemical reaction that enzymes catalyze.    c.  this implies that if a cell has a problem with its dna, its rna can compensate for the damaged dna.    d.  this implies that dna and proteins evolved after rna.