Which of the following could be true of two different species that have a competitive relationship in the same ecosystem? . a. one species preys on the other.. b. the relationship is mutually beneficial.. c. they share the same niche.. d. one species benefits, while the other is neither nor harmed..

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.