Fact 1: Echinoderms use pheromones to communicate with each other. Fact 2: Echinoderms are represented by the starfish. Given the two facts above, starfish use _ to communicate with each other.?
OPT:
I. scattered light;
II. pheromones;
III. heat produced;
IV. sound;
V. waves;
VI. Chemical energy;
VII. electricity;
VIII. kinetic energy;
II.