The image shows sedimentary rock layers. Horizontal sedimentary rock layers, labeled 1 to 4 from top to bottom.

According to the law of superposition, which layer is the oldest?

1
2
3
4

How long does it take a skateboarder going 6.0 m/s to come to a complete stop if she slows down at a rate of 2.0 m/s^2

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.

Where are chlorophyll molecules located within the chloroplasts?