Using the periodic table, predict which element-potassium, aluminum, or iron-is most reactive. explain your answer.

1) this is the structure in the cell nucleus that houses a cell's genetic information

This active feature of earth's crust in building mountain ranges as well as islands. this feature is a a) cavern. b) earthquake. c) mountain. d) volcano.

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange