What type of natural selection would have the mean/average trait move in one direction?

a. directional

b. selective

c. disruptive

Which best explains why there are 64 possible codons in the genetic code and only 20 amino acids that make protiens of living organisms on earth

Which of the following does not describe a physical property of iron? a iron is silvery-white or gray in color. b iron has a boiling point of about 3,000°c. c iron is a magnetic element . d iron and sulfur react to form iron sulfide.

What molecule does hemoglobin decay into over time