Answer:
- Julia's speech is after the speech on political issues, so she's giving the speech on water conservation.
- The person giving the solar power speech helped Ethan and Julia with their presentations, so that means they're giving the speech on recycling.
- Since Ethan isn't interested in political issues and is speaking last, he's giving the speech on solar power.
- Since Caleb is speaking after Julia, he's giving the speech on political issues.
Explanation: