Two examples of adaptive radiations are

Answer

### Step-by-Step Solution

1. **Definition of Adaptive Radiation**:
- Adaptive radiation is the evolutionary process in which organisms diversify rapidly into a variety of forms to adapt to different environments. This occurs when a single ancestral species gives rise to multiple species that adapt to various ecological niches.

2. **First Example - Basal Mammalians**:
- One prominent example of adaptive radiation is the evolution of basal mammalians. These mammals radiated from a common ancestor into various forms that adapted to different modes of life, such as running, jumping, climbing, swimming, and flying. This diversification allowed them to occupy different ecological niches.

3. **Second Example - Australian Marsupials and Darwin's Finches**:
- Another example of adaptive radiation includes Australian marsupials, which evolved from a common ancestor into various species adapted to different habitats in Australia. Additionally, Darwin's finches from the Galápagos Islands are a classic example, where different species evolved from a common ancestor to adapt to different food sources and environments on the islands.

### Final Answer
Two examples of adaptive radiations are:
1. Basal Mammalians
2. Australian marsupials and Darwin's finches

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