Why do classification systems change over time?

a. scientists find new evidence in their studies.
b. scientists use old methods of classification.
c. scientists repeat experiments and find no changes.
d. scientists find similar evidence to previous work.

Athermometer is placed in water in order to measure the water’s temperature. what would cause the liquid in the thermometer to rise?

Which of the following statements regarding anfinsen's denaturing experiments with ribonuclease a (rnase a) are valid? exposing the denatured protein to air oxidation and then dialysis to remove urea restored the protein to its original functionality. removing urea by dialysis and then allowing air oxidation of the denatured protein restored the protein to its original functionality. denaturing the protein with both urea and β-mercaptoethanol yielded an inactive protein. anfinsen concluded that protein folding is determined by its primary sequence.

Which of the following statements is true? 1. the mantle of the earth is made of solid nickel and iron. 2. the crust of the earth is made of solid nickel and iron. 3. the inner core is made of solid nickel and iron.