Q: Fact 1: Echinoderms use pheromones to communicate with each other. Fact 2: All echinoderms are deuterostomes . Given the two facts above, at least some deuterostomes use pheromones to do what?

Choose from: 1. attack prey; 2. seed dispersal; 3. share properties; 4. deuterostome with each other; 5. not communicate; 6. Release energy; 7. mate with females; 8. communicate with each other;
The answer is:
8.