A bird eats a fly. The bird and fly are demonstrating a. Predation b. Parasitism c. mutualism d. commensalism

The correct answer is **a. Predation**.<br /><br />Here's why:<br /><br />* **Predation** is a biological interaction where one organism, the predator (the bird), kills and eats another organism, its prey (the fly).<br /><br />Let's look at why the other options are incorrect:<br /><br />* **Parasitism:** In parasitism, one organism (the parasite) benefits at the expense of another (the host), but the parasite typically doesn't kill the host directly. <br />* **Mutualism:** Mutualism is a relationship where both organisms benefit.<br />* **Commensalism:** Commensalism is a relationship where one organism benefits and the other is neither harmed nor helped.<br />