We should not allow mosquitoes to bread in our surroundings because they

Options

A. multiply very fast and cause pollution
B. are vectors for many diseases
C. bite and cause skin diseases
D. are not important insects

Explanation

**Step-by-Step Solution:**

1. **Understanding Mosquitoes as Vectors:**
- Mosquitoes, particularly certain species, are known to act as vectors. This means they can carry and transmit disease-causing microorganisms from one host to another.

2. **Identifying Disease-Causing Microorganisms:**
- Female mosquitoes, such as the Anopheles and Aedes species, are responsible for transmitting specific diseases. For instance, the Anopheles mosquito carries the Plasmodium parasite, which causes malaria, while the Aedes mosquito carries the dengue virus, leading to dengue fever.

3. **Recognizing the Dangers of Mosquito-Borne Diseases:**
- Diseases like malaria and dengue are serious health threats. They can lead to severe health complications and can even be fatal if not treated promptly.

4. **Evaluating the Options:**
- The question provides several options regarding why we should not allow mosquitoes to breed:
- **Option A:** They multiply very fast and cause pollution. (Incorrect, as pollution is not directly related to mosquito breeding.)
- **Option B:** They are the vectors for many diseases. (Correct, as mosquitoes transmit diseases.)
- **Option C:** They bite and cause skin diseases. (Incorrect, as mosquitoes do not primarily cause skin diseases.)
- **Option D:** They are not important insects. (Incorrect, as they are important vectors for diseases.)

5. **Conclusion:**
- The correct answer is that we should not allow mosquitoes to breed in our surroundings because they are vectors for many diseases, such as malaria and dengue.

---