Triops/Apus is

Options

A. Marine Crustaceans
B. Fresh water Crustaceans
C. Fresh water arachnid
D. Terrestial arachnid.

Answer

To determine what Triops/Apus is, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Organism**: Triops, commonly known as tadpole shrimp, belongs to a specific class within the phylum Arthropoda.

2. **Classify the Organism**: Triops is classified under the class Crustacea. This is important because it helps narrow down the options based on its classification.

3. **Determine the Habitat**: Triops is primarily found in freshwater environments. This characteristic is crucial for identifying the correct option from the given choices.

4. **Examine the Options**:
- **Option A: Marine Crustaceans** - This is incorrect because Triops is not marine; it is freshwater.
- **Option B: Freshwater Crustaceans** - This option aligns with our findings as Triops is indeed a freshwater organism.
- **Option C: Freshwater Arachnids** - This option is incorrect because Triops is not an arachnid; it belongs to the crustaceans.
- **Option D: Terrestrial Arachnids** - This option is also incorrect as it misclassifies Triops, which is a crustacean, not an arachnid.

5. **Select the Correct Answer**: Based on the classification and habitat, the correct answer is **Option B: Freshwater Crustaceans**.

### Final Answer:
Triops/Apus is a **freshwater crustacean**.

---