I need to know asap. please HELP

Using data from seismic waves, geologists have learned that earth’s interior is made up of several

1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6

To calculate the molarity of a solution, you need to know the moles of solute and the