How did the border between france and germany protect southern france in world war 1

How does a command economy differ from a mixed market economy? in a command economy, citizens have fewer property rights. in a mixed market economy, citizens have more property in a command economy, citizens have more property rights. in a mixed market economy, citizens have fewer property rights in a command economy citizens own all public property. in a mixed market economy, the government owns all private, property in a command economy, citizens own all private property in a mixed market economy, the goverment owns all public property

Which of the following is a way that advancements in technology improve humans' ability to measure air quality and protect human health?

Simple astronomical telescope the objective lens has a focal length of 75 cm and that of a piece of 5cm of the lenses are 18 cm apart when will be final image of a distant object before