Hurry ! what is usually needed for generating electrical energy when using fossil fuels but not needed when using wind or water? a)energy put into the plant b)rotating generators c)spinning turbines d)high-pressure steam

What are the four basic classes of organic molecules how do they differ structurally and functionally

The most effective way to provide children with safety messages is to

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.