1) in biology, a trait that arose in an ancestor and is passed along to its descendents is referred to as
a. derived character
b. taxonomic group
c. molecular clock
d. physical similarity
2)which of the following idea is supported by darwins observation of locals variation amoung tortoises in the galapogos island>
a. artificial selection
b. adaptation
c. acquired characteristics
d. tendency towards perfection

During an experiment, readings for blood pressure in a persons body were found to be constant . however , when he measured by a different blood pressure cuff , the readings differed by 15 points for each reading. this difference indicates that the results are

Is becoming less expensive to screen blood samples for dna certain diseases have genetic basis what is possible ethical concern about the availability of inexpensive dna testing

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.