Why do animals not have photosynthesis? A. animals have chloroplasts

B. animals do not have chloroplasts

C. animals have vacuoles

D. animals have cell walls

The relationship between intron and exon

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.

Alarge body of air that has similar temperature, humidity and air pressure at a given height is called a