Which of the following is a cost associated with the development of the
internal combustion engine used in most cars?
a. burning fuel releases carbon monoxide and other chemicals into
the air.
o
b. cars allow people to move from place to place more efficiently.
o
c. the development of the car led to developments in aviation
o
d. cars are a safer form of transportation than previous options.

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.