Q: Fact 1: Ants communicate with chemicals called pheromones. Fact 2: Ants use receptors on their antennae to follow recruitment pheromone trails. Given the two facts above, some insects communicate with what detected by their antennae?

Pick from:
(1). chemicals.
(2). sound.
(3). microwaves.
(4). radio waves.
(5). flash cards.
(6). Decibels.
(7). wave in air.
(8). Vibrates.
A:
(1).