What you're likely looking for are examples of relationships that *are not* parasitic. Here are some common types of relationships that can be contrasted with parasitism:
1. Mutualism: Both organisms benefit from the relationship.
* Example: Bees and flowers. Bees get nectar from flowers and in turn, pollinate them, allowing them to reproduce.
2. Commensalism: One organism benefits, while the other is neither harmed nor helped.
* Example: Barnacles on a whale. Barnacles get a place to live and transport, while the whale is unaffected.
3. Amensalism: One organism is harmed, while the other is unaffected.
* Example: A large tree shading out smaller plants. The tree is unaffected, while the plants struggle to get sunlight.
4. Predation: One organism (the predator) kills and eats another organism (the prey).
* Example: A lion hunting a zebra.
5. Competition: Two or more organisms compete for the same resources.
* Example: Two different species of birds competing for the same food source.
These examples show a range of relationships between organisms. While parasitism is a specific type of relationship, understanding these other types helps us appreciate the complexity of interactions within ecosystems.