In the developmental history of mammalian heart. It is observed that it passes through a two chambered fish like heart, three chambered frog like heart and finally four chambered stage. To which hypothesis can this above cited statement be approximated?

Options

A. Lamrack's principle
B. Mendelian principle
C. Biogenetic law
D. Hardy Weinberg law

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question discusses the developmental stages of the mammalian heart, which transitions from a two-chambered heart (like that of fish) to a three-chambered heart (like that of frogs) and finally to a four-chambered heart (like that of birds and mammals). We need to identify the hypothesis that relates to this observation.

2. **Identifying the Key Concept**: The key concept here is the relationship between embryonic development (ontogeny) and evolutionary history (phylogeny). This relationship suggests that the development of an organism reflects its evolutionary lineage.

3. **Recalling Relevant Theories**: The theory that best explains this relationship is the biogenetic law, famously summarized by Ernst Haeckel's phrase "ontogeny recapitulates phylogeny." This law suggests that the development of an individual organism (ontogeny) follows the same progression as the evolutionary history of that organism's species (phylogeny).

4. **Applying the Biogenetic Law**: According to the biogenetic law, during the embryonic development of mammals, the heart first resembles that of fish (two chambers), then that of amphibians (three chambers), and finally develops into the four-chambered heart characteristic of mammals. This sequence mirrors the evolutionary progression from fish to amphibians to mammals.

5. **Conclusion**: The statement in the question can be approximated to the biogenetic law, which indicates that the embryonic development of an organism reflects its evolutionary history. Therefore, the correct answer is that this observation aligns with the biogenetic law proposed by Haeckel.

**Final Answer**: The hypothesis that can be approximated from the given statement is the biogenetic law, which states "ontogeny recapitulates phylogeny."

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