Most primitive living mammals, which provide an evidence of organic evolution from geographical distribution are found in

Options

A. China
B. India
C. Australia
D. Africa

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the most primitive living mammals that provide evidence of organic evolution through geographical distribution.

2. **Identifying Primitive Mammals**: Primitive mammals refer to those that have retained more ancestral traits. In this context, marsupials are considered primitive because they do not have a placenta and carry their young in pouches.

3. **Geographical Distribution**: The question hints at geographical distribution, which relates to how species are spread across different regions due to historical events like continental drift.

4. **Continental Drift**: Approximately 120 million years ago, the continents were positioned differently. Australia was separated from Asia, which played a significant role in the evolution of mammals.

5. **Marsupials and Monotremes**: After the continental drift, marsupials (mammals without a placenta) and monotremes (egg-laying mammals) evolved in isolation in Australia. Uterian mammals (those with a true placenta) were introduced artificially and did not evolve there naturally.

6. **Conclusion**: The most primitive living mammals, which include marsupials and monotremes, are primarily found in Australia due to the historical geographical separation from other landmasses.

**Final Answer**: The most primitive living mammals are found in Australia.

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