7. What is the role of pheromones in the mass migrations of ants?
A. Pheromones are used to create a trail that directs the ants during migrations.
B. Pheromones signal the ants that nest has been invaded and must de abandoned.
C. Pheromones control the speed at which ants move from one location to anther.
D. Pheromones enable scouts to identify suitable areas for establishing a new nest.
8. The word “scurrying” in line 16 is closest in meaning to.
A. agreeing.
B. appearing.
C. competing.
D. rushing.
9. The word “others” in line 21 refers to.
A. private messages.
B. species.
C. trails.
D. signals.