The most common problem is bone desnity loss, but others are loss of fitness and muscle strength.
NO
Gravity
Gravity
Without the force of gravity we wouldn't even be here.
Without gravity we could not stay on the surface of the Earth -- but that wouldn't matter, because gravity is what keeps the Earth from flying apart.
NO, you need live. Period.
You die if you are decapitated, you can not live without a head!
Microgravity affects the growth of plants, but doesn't outright kill them.
They can live without oxygen for a short period of time.
Without a period, this sentence is incomplete or Humans cannot live without food or water.
No. Platypuses cannot live without water, even for a short period of time. They need it to drink and as a food source.
All post-menopausal women not on HRT do.