Which statement is true about the environment of urban areas?
A) Urban areas have few problems with soil erosion.
B) Urban areas have more rain infiltration into the soil.
C) Urban areas have higher temperatures.
D) Urban areas have less habitat fragmentation.

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.