The term that describes any trait that gives a plant or animal an advantage in its environment is adaptation.

Here's why:

* Adaptation refers to a feature or characteristic that has evolved over time to help an organism survive and reproduce in its specific environment.

* These adaptations can be physical (like a cactus's spines), behavioral (like a bird's migration pattern), or physiological (like a fish's ability to breathe underwater).

Let me know if you'd like more examples of adaptations!