Think small
You are a microbe in a human body. You can perform benificial tasks (normal flora), fight other organisms within the body, or take on the body's defenses.
Over time you can develop new ablities: resistance to antibiotics, a capsule, motility, new methods of attack or defense against other microbes.
You could join others in a colony, escape the body to adventure in other bodies, maybe even mutate into a multicellular critter.
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Ass, gas or grass. Nobody rides for free.
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