What property of the atmosphere will change with altitude change

We have a colorless transparent liquid. it looks like water. we seperated it into a solid and a liquid by evaporration and condention was this a chemichal or a physical seperation a. chemical seperation b. physical seperation

What is the primary force that suspension bridges use cables to hold their spans up? a. tension force b. resistance force c. normal force d. elastic force e. applied force

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.