I'm not sure what the alien theory says or if there really is such a theory. if the theory says that aliens definitely exist and that they have visited earth in the past then the theory is totally and completely without any kind of support. it's not scientific in any way because there is no evidence for such a claim. it may be thought to be probable but no solid evidence has ever been presented read more on -

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.