Rust and Cannonball are two very different worlds in most ways, with very different chemical environments and very different types of life*--but they have one important feature in common: they have no large natural bodies of liquid on their surfaces, and native lifeforms don't require any environmental supplies of liquid to survive.
Approximate equivalents of plants and fungi do just fine in these environments--there is a clear path from single-celled organisms clinging to sand grains to colonies that spread over a wide area as cells divide, to truly multi-cellular sessile organisms whose cells grow and divide in an intentional, directed manner to form rhizome networks, and grow reproductive structures above the ground for spore/pollen/seed dispersal on the wind.
But what about animals? How do macroscopic mobile heterotrophs evolve when there is no sea to support their bodies in the early stages?
[*] I don't expect it's particularly relevant to the question, but for the curious: Native Rust life is packed with deliquescent compounds that suck small amounts of water vapor out of the air to maintain a super-salty, but liquid, intracellular environment, with energy metabolism based around hydrogen peroxide as an oxidizer and hygroscopic agent. Native Cannonball life, on the other hand, absorbs iron from the soil and CO2 from the air to photosynthesize iron pentacarbonyl as an intracellular fluid and energy storage molecule, and decomposes various metal carbonyls to regenerate CO2 and release energy.