Which statement describes an important role of carbon dioxide in Eartly's atmosphere? Animals breathe carbon dioxide
Plants use carbon dioxide to make food,
Carbon dioxide helps animals make proteins
Carbon dioxide forma clouds that produce rain

What does natural resource management aim at ?

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs

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.