larger to smaller in size, of the following substances: compound, atom, neutron, molecule, electron, and matter

25) a student takes four samples of a white crystalline solid and places each in a well plate. on top of each sample, she carefully places 20 drops of clear mystery liquids a, b, c and d. her results for each well are: liquid a: the solid dissolves quickly. liquid b: the solid appears unchanged. liquid c: a brownish colored liquid is produced. liquid d: fizzing occurs and the well becomes warmer. in which well does a physical change occur?

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

Are the earth's ocean floor and continents the same age geologically? why or why not?