Frogs, lizards, and birds all have a similar
arrangement of bones in their limbs. which of the
following does this similarity most
likely indicate about these animals?
a. they move in the same way.
b. they have a common ancestry.
c. they evolved at the same time.
d. they are comparable in size as adults.

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.