6. Thought to emanate from a tiny gland on the underside of their bodies, ants leave behind pheromone trails that can be used as signals or messages for other ants.
A. Thought to emanate from a tiny gland on the underside of their bodies, ants leave behind pheromone trails that can be used
B. Ants leave behind pheromone trails that are thought to emanate from a tiny gland on the underside of their bodies, and they can use this
C. Thought to emanate from a tiny gland on the underside of ants’ bodies, pheromone trails left behind can be used
D. Emanating it is thought from a tiny gland on the underside of their bodies, ants leave behind pheromone trails they can use
E. Emanating, it is thought, from a tiny gland on the underside of their bodies, pheromone trails are left behind by ants that can be used