The animal group which does not exist in Galapagos island is

Options

A. Insects
B. Protozoa
C. Crustacea
D. Amphibia

Explanation

To solve the question regarding which animal group does not exist in the Galapagos Islands, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for an animal group that is absent from the Galapagos Islands. The options given are insects, protozoa, crustaceans, and amphibians.

2. **Analyze Each Option**:
- **Insects**: Insects are known to inhabit a wide range of environments, including islands. They are present in the Galapagos Islands.
- **Protozoa**: Protozoa are microscopic organisms that can be found in various habitats, including freshwater and marine environments. They are also present in the Galapagos Islands.
- **Crustaceans**: Crustaceans, such as crabs and shrimp, are marine animals that can be found in the waters surrounding the Galapagos Islands. They are present there.
- **Amphibians**: Amphibians, which include frogs and salamanders, typically require freshwater habitats for breeding. They are not found in the Galapagos Islands.

3. **Identify the Correct Answer**: Based on the analysis, amphibians are the only group listed that does not exist in the Galapagos Islands. This absence is attributed to their inability to cross the saline waters from the mainland to the islands.

4. **Conclusion**: The correct answer is **amphibia**.