What effect would gravity have on jellyfish if it were taken out of water?

Answer 1

Gravity is the same for a jellyfish whether they are in water or out of water. However, that is not to say that taking a jellyfish out of water would have no effect. The difference is that, in water, their neutral buoyancy allows them to float and their relatively weak muscles allow them to move, their tentacles to extend and contract, and their oral arms to bring food near their mouths. When you take a jellyfish out of water, though, their density is so much greater than air that they become a limp noodle, and their weak muscles cannot overcome their crushing weight. Although gravity is certainly a factor, it is constant. The relative buoyancy between the two environments is the real difference between floating like a butterfly in water, or laying on the beach like a formless blob.