This is the most diverse of all the marine ecosystems. this marine ecosystem not only includes great biodiversity but at least one quarter of all ocean species depend on it for food and shelter. what is this marine ecosystem? a) coral reef b) kelp forest c) coastal estuary d) bathypelagic zone.

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.