When using a manometer to check Boyle's law, why is the pressure changed slowly? to avoid compressing the gas to avoid changing the mass of the gas to avoid compressing the liquid to avoid changing the gas temperature

Lets say that an object of a certain volume has a certin mass. what happens to its mass when you double its volume?

1.what is where an object is located 2. what is how fast an objects speed is changing 3. what is how fast an object is moving

What changes occur in the brain during the teenage years? 25 points, someone me out!a.) thinking becomes slower as the brain grows larger. b.) connections between neurons become stronger and faster. c.) unused neurons fuse together to form larger, better functioning neurons. d.) more neurons are developed.