I'm trying to create a habitable planet but with a low atmospheric pressure, similar to Mars. But instead with 15 percent of Earth's atmospheric pressure, what traits can I give my animals so they have the best chances to survive? If the atmospheric composition is about the same as Earth and orbiting a star like the sun at the same distance, it also has only 51% of Earth's gravity. Also 60 percent of its surface is covered by water.
Some other details about the planet,
Distance from primary star - 1 AU
Star - Sunlike
Mass - 0.14949 (M⊕)
Diameter - 6881 km
Gravity - 0.51 g
Oceans - 60% surface coverage
Atmosphere - Earthlike
Density - 5.25 g/cm3, slightly higher than Venus.. Hopefully this unusually high density for a small terrestrial planet is enough to generate, at least, a weak magnetic field, similar to Mercury maybe!