What happens to the mass of a substance during a physical change?

Will mark brainliest 26. which of these statements are true? (3 points) a. gases are compressible b. gases fill their containers completely c. the pressure of a gas is independent of the temperature d. gases have mass e. gases exert pressure f. the pressure of a gas is dependent on the volume g. gas pressure results from the collisions between gas particles h. gases have a definite volume and shape

What is the main reason why some developing countries fear the increase the free trade policies around the world?

Ineed this asap part i: scientific method what is the difference between science and pseudoscience? what is the scientific method?