* Divergent Evolution: This is the process where species with a common ancestor evolve to become increasingly different over time. This often occurs due to different environmental pressures or selective pressures. For example, Darwin's finches on the Galapagos Islands developed different beak shapes based on the food sources available on each island.

Let's look at why the other options are incorrect:

* Predation Adaptation: While predation can drive evolutionary changes, it doesn't necessarily lead to organisms becoming less alike. Predators and prey often evolve adaptations in response to each other, which can make them more distinct but also sometimes more closely linked.

* Convergent Evolution: This is the opposite of divergent evolution. It's when unrelated species evolve to become more similar due to similar environmental pressures. For example, sharks (fish) and dolphins (mammals) both have streamlined bodies and fins for efficient swimming in the ocean.

* Related Organisms: The question specifically mentions related organisms, which implies a shared ancestry. Divergent evolution is the primary way related organisms become less alike.

In summary, divergent evolution is the process that drives related organisms to become less alike over time.