Identifying the functions of the structures of the excretory system:
Identify the functions of the labeled parts
A
B
C
D
possible answers
produces urine
carries urine to the bladder
stores urine temporarily
excretes urine out of the body

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.