One constant across evolution

Species have evolved to adapt to many environments. Some have devised ways to avoid predators and others can survive in extreme heat, cold, or pressure deep in the ocean. Over time, most conditions have changed in one way or another but one thing has remained constant across all forms of evolution on Earth - gravity.

I'm curious how organisms from Earth (or elsewhere) evolve when put into different gravity environments with other variables held constant. It's a known phenomenon that human biology behaves differently in space; astronauts have an increased risk of bone demineralization and kidney stones. Overcoming these challenges is a key step in preparing for extended space missions.

This is a good example of when we don't know what we don't know. I'm looking forward to finding out how commonly held postulates are implicitly tied to Earth's gravity.