Of the homologous pairs of animals that represent placental on mainland and marsupial in Australia, which one is incorrect ?

Options

A. Mole-marsupial mole
B. Wolf-tasmanian wolf
C. Bat-wombat
D. Flying squirrel-flying phalanger

Answer

To determine which of the homologous pairs of animals representing placental mammals on the mainland and marsupials in Australia is incorrect, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Terms**:
- **Homologous Structures**: These are structures that share a common ancestry but may serve different functions in different species.
- **Analogous Structures**: These are structures that serve similar functions but do not share a common ancestry.

2. **Identify the Given Options**:
- We need to analyze the pairs of animals provided in the options to see which ones are homologous and which ones are analogous.

3. **Analyze Each Pair**:
- **Option 1**: Mole (placental) and Marsupial Mole (marsupial) - These are examples of convergent evolution, where two different species evolve similar traits due to similar environmental pressures.
- **Option 2**: Bat (placental) and Flying Fox (marsupial) - These are also examples of convergent evolution, as both have developed wings for flight but are not closely related.
- **Option 3**: Bat (placental) and Wombat (marsupial) - This pair is incorrect as they do not share a homologous relationship. Bats and wombats have different functions and structures, and they evolved in different environments.
- **Option 4**: Dolphin (placental) and Shark (not a mammal) - This is another example of analogous structures, as both have streamlined bodies for swimming but are not closely related.

4. **Conclusion**:
- The incorrect pair representing placental and marsupial animals is **Option 3: Bat and Wombat**. They do not share a homologous relationship and are examples of analogous structures instead.

### Final Answer:
The incorrect pair of homologous animals representing placental on mainland and marsupial in Australia is **Option 3: Bat and Wombat**.