Answer: supplied air mask
Explanation: because air can go in the mask and the gases and fumes can hurt you.
<span>Johnson dubbed the domestic program the "Great Society" -- a sweeping set of New Dealish economic and welfare measures aimed at transforming the American way of life.</span>
A good advancement would be a portable radio. They have made life easier for people who are walking/hiking and are looking for something such as the weather for the night or the score for a sports game.
If it doesn’t contain any of the following definition then it’s wrong
A planet is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit.