How does air pressure affect
breathing?

When you inhale, muscles increase the size of your thoracic (chest) cavity and expand your lungs. This increases their volume, so pressure inside the lungs decreases. As a result, outside air rushes into the lungs. That's because a gas always flows from an area of higher to lower pressure.

a chair, a bed, and a toothbrush

explanation:

i was told this before by a teacher, so yeah

the real answer is b. scintillation counter