An asthma attack is when the muscles in your airway swell up, causing your airways so shrink. This is due to an allergic reaction, in witch you inhale something and your body "over reacts" to it.
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E: because public health policies improved a lot of things. Hope I helped:)
Since everything is “lighter” in space due to the lack of gravity, you don’t need as much strength to do things so your muscles begin to deteriorate and weaken because you aren’t maintaining your strength.
