What is the similarity between fly, mosquito and cockroach

Options

A. Thirteen-chambered heart
B. Three pairs of legs
C. Open excretory system
D. Housefly

Answer

To determine the similarities between a fly, mosquito, and cockroach, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Classification**:
- All three organisms (fly, mosquito, and cockroach) belong to the Phylum Arthropoda and the Class Insecta. This is the first similarity as they are all classified under the same group of animals.

2. **Examine Body Structure**:
- They all have a segmented body structure which is characteristic of insects. This includes a head, thorax, and abdomen.

3. **Count the Legs**:
- Each of these insects has three pairs of legs, which totals to six legs. This is a defining characteristic of insects.

4. **Circulatory System**:
- They possess an open circulatory system. In this system, the blood is not always contained within blood vessels but flows freely through cavities in the body.

5. **Excretory System**:
- While they do have an excretory system, it is not open. Instead, they have specialized structures for excretion, such as Malpighian tubules.

6. **Conclusion**:
- The primary similarity between a fly, mosquito, and cockroach is that they all belong to the same phylum and class, have three pairs of legs, and possess an open circulatory system.

### Final Answer:
The similarity between a fly, mosquito, and cockroach is that they all belong to the Phylum Arthropoda, Class Insecta, and have three pairs of legs.