Which statement best describes how Carl Woese changed the system of classification?

He removed a level and a kingdom.
He added a level and a kingdom.
He removed a level and added a kingdom.
He added a level and removed a kingdom.

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?

How many moles are contained in 5.6 l of h2 at stp

Jenny places a strip of ph paper into a solution. when she removes the ph paper, it has turned yellow-green. what should jenny do next to determine the ph of her solution? a. use a different testing method because the ph paper should not change colors b. place the ph paper into a machine that reads the ph of the solution c. compare the ph paper's color with the color of ph paper from another solution d. compare the ph paper's color with a chart of colors and ph ranges