Some scientists think that Earth goes through natural cycles of warming and cooling. What is different about the current cycle of temperature change?
A. It warming more slowly than previous natural cycles.
B. It is cooling more slowly than previous natural cycles.
C. It is warming faster than previous natural cycles.
O D. It is cooling faster than previous natural cycles.
SUBMIT

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.