Bombinator threatens its adversary by

Options

A. sprinkling blood
B. Exposing its belly having orange red patches
C. producing hissing sound
D. both B and C

Answer

### Step-by-Step Solution:

1. **Identify the Species**: The question refers to the Bombinator, which is commonly known as the fire-bellied toad (genus Bombina).

2. **Understanding the Threat Response**: The Bombinator has a specific way of threatening its adversaries or predators. This involves a combination of visual and auditory signals.

3. **Coloration**: The Bombinator has a bright lime green color on its dorsal (upper) surface, adorned with black spots. This coloration is typical for camouflage in its environment.

4. **Defensive Mechanism**: When threatened, the Bombinator reveals its belly, which is characterized by bright orange-red patches. This sudden exposure of a contrasting color serves as a warning signal to potential predators.

5. **Auditory Signal**: In addition to displaying its colorful belly, the Bombinator produces a hissing sound. This sound, combined with the visual display, enhances the intimidating effect.

6. **Impression of Danger**: The combination of the bright colors and the hissing sound creates an impression that the toad is dangerous or "on fire," which can scare off predators.

7. **Conclusion**: Therefore, the Bombinator threatens its adversaries by exposing its brightly colored belly and producing a hissing sound, which together serve to ward off potential threats.

### Final Answer:
The Bombinator threatens its adversary by exposing its orange-red belly and producing a hissing sound.