Answer:
Sequence
Step-by-step explanation:
The passage is arranged in a chronological order, describing how dolphins communicate with each other.
First, dolphins use vocalization to communicate. They produce creaks, whistles, screams, chuffs, pops, squawks, and chirps. With these sounds, dolphins communicate anger, frustration, affection, and contentment with each other.
Next, dolphins use visual signals to convey information. A vigorous bobbing of the head, a wide-open gaping mouth, bubble bursts, bubble clouds, an S-shaped swimming position, and flared-out pectoral fins convey frustration, threat or anger.