"Tadpoles respire through gills". This statement supports 

Options

A. Law of thermodynamics
B. 10% law
C. Biogenetic law
D. None

Answer

To solve the question "Tadpoles respire through gills. This statement supports:", we need to analyze the options provided and understand the implications of tadpoles having gills.

### Step-by-Step Solution:

1. **Understanding Tadpoles**:
- Tadpoles are the larval stage of frogs, which are amphibians. They primarily live in water and have gills for respiration.

2. **Respiration in Tadpoles**:
- The fact that tadpoles breathe through gills indicates that they are adapted to an aquatic environment, similar to fish (Pisces). This is crucial as it highlights their evolutionary background.

3. **Amphibian Characteristics**:
- Amphibians, like frogs, can live both in water and on land. However, their larval stage (tadpoles) is aquatic and relies on gills for oxygen.

4. **Biogenetic Law**:
- The biogenetic law, also known as "ontogeny recapitulates phylogeny," suggests that the development of an organism (ontogeny) reflects the evolutionary history (phylogeny) of its species. In this case, the presence of gills in tadpoles supports the idea that they share a common ancestry with fish.

5. **Evaluating Other Options**:
- **Law of Thermodynamics**: This law pertains to energy transfer and does not relate to the respiratory adaptations of tadpoles.
- **10% Law**: This law refers to energy transfer in food chains and is unrelated to the anatomical features of tadpoles.

6. **Conclusion**:
- Given that tadpoles have gills and this reflects their evolutionary lineage from fish, the statement supports the **biogenetic law**.

### Final Answer:
The statement "Tadpoles respire through gills" supports the **biogenetic law**.

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