Astronauts experience similar feelings of dizziness and disorientation upon arrival in space and upon their arrival back on earth. what does this indicate to researchers?

a.
the vestibular sense is very sensitive to changes in climate.
b.
the vestibular sense may be capable of sensory adaptation.
c.
the vestibular sense is not affected by changing conditions.
d.
the vestibular sense may be confused by zero-gravity climates.

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.