Which of these is not a classical example of adaptive radiation in the development of new species?

Options

A. Darwin's finches
B. Marsupials of Australia
C. Giant turtle
D. Evolution of human

Answer

To determine which of the provided options is not a classical example of adaptive radiation in the development of new species, we can analyze each option step by step.

### Step 1: Understand Adaptive Radiation
Adaptive radiation is the process through which organisms diversify rapidly into a wide variety of forms to adapt to different environments. This typically occurs when a species colonizes a new area with diverse habitats.

**Hint:** Remember that adaptive radiation involves the diversification of a single ancestral species into multiple new forms based on environmental pressures.

### Step 2: Analyze the Options
1. **Darwin's Finches**: These birds are a well-known example of adaptive radiation. They evolved from a common ancestor into various species with different beak shapes adapted to their specific feeding habits on the Galapagos Islands.

**Hint:** Look for examples where a single species evolves into multiple forms based on environmental adaptation.

2. **Marsupials of Australia**: Marsupials have diversified into various forms in Australia, adapting to different ecological niches (e.g., kangaroos, koalas, and Tasmanian devils). This is another clear example of adaptive radiation.

**Hint:** Consider how species in isolated environments adapt to fill different ecological roles.

3. **Giant Tortoise**: The giant tortoises of the Galapagos Islands also represent adaptive radiation. Different islands have different species of tortoises that have adapted to their specific environments.

**Hint:** Think about how species can evolve differently based on geographic isolation.

4. **Evolution of Man**: While the evolution of humans involves various adaptations, it is not typically classified as adaptive radiation. Human evolution is more about the development of traits over time rather than the rapid diversification from a single ancestor into multiple forms.

**Hint:** Reflect on whether the evolution of a species can be considered a diversification into multiple forms or if it is a linear progression.

### Step 3: Conclusion
From the analysis, the option that is not a classical example of adaptive radiation is **the evolution of man**. While human evolution includes adaptation, it does not fit the classical definition of adaptive radiation as it does not involve rapid diversification into multiple distinct species from a single ancestor.

### Final Answer
The option that is not a classical example of adaptive radiation in the development of new species is **the evolution of man**.

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