Protein is essential to the overall health of the body because it
a. sustained life and keeps body systems in good repair
b. build up muscles
c. gives the body collagen which protects the organs
d. keeps hair and nails healthy

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.