Which is nonpoisonous

Options

A. Scorpion
B. Centipede
C. Crab
D. Spider.

Answer

To determine which among the given options is nonpoisonous, we can analyze each option one by one:

1. **Scorpion**: Scorpions are known to possess venom, which they use to subdue their prey and for defense. Therefore, scorpions are considered poisonous.

2. **Centipede**: Centipedes also have venomous bites. They use their venom to capture prey and defend themselves. Thus, centipedes are poisonous as well.

3. **Crab**: While some species of crabs can carry lethal doses of toxins, the majority of crabs are not considered poisonous. Crabs do not produce toxins themselves; rather, they may accumulate toxins from their environment or food sources. Therefore, crabs are generally regarded as nonpoisonous, although caution is advised when consuming certain species.

4. **Spider**: Most spiders are venomous to some degree, as they use venom to immobilize their prey. Some spiders can be harmful to humans, making them poisonous.

Based on this analysis, the correct answer is **crab**, as it is the only option that is generally considered nonpoisonous.

### Step-by-Step Solution:
1. Identify the options: Scorpion, Centipede, Crab, Spider.
2. Analyze each option for poisonous characteristics.
- Scorpion: Poisonous.
- Centipede: Poisonous.
- Crab: Generally nonpoisonous, but some species can be toxic.
- Spider: Poisonous.
3. Conclude that the crab is the nonpoisonous option.