Which of the following statements about M phase is true? a. The mitotic spindle helps segregate the chromosomes to the two daughter cells. b. The mitotic spindle is largely made of intermediate filaments. c. The contractile ring divides the nucleus in two. d. The contractile ring is made largely of microtubules and actin filaments.

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.