1. **State the problem:** Identify what groups of many different species living together in an ecosystem are called. 2. **Recall definitions:** - A **Population** is a group of individuals of the same species. - A **Community** is a group of many different species living together in an ecosystem. - **Symbiosis** is a close and long-term biological interaction between two different biological organisms. - An **Individual** is a single organism. 3. **Answer:** The correct term for groups of many different species living together in an ecosystem is **Community**. 1. **State the problem:** Identify the type of symbiotic relationship where birds clean the teeth of alligators. 2. **Recall symbiotic relationships:** - **Mutualism:** Both species benefit. - **Commensalism:** One benefits, the other is unaffected. - **Parasitism:** One benefits at the expense of the other. 3. **Explanation:** Birds cleaning alligator teeth benefit by getting food, and alligators benefit by having their teeth cleaned. 4. **Answer:** This is an example of **Mutualism**.