Neo-Darwinism believes that new species develop through

Options

A. Mutations with natural selection
B. Continous variations with natural selection.
C. Hybridisation
D. Mutations

Answer

### Step-by-Step Solution:

1. **Understanding Neo-Darwinism**: Neo-Darwinism is an extension of Charles Darwin's theory of evolution. It incorporates modern genetics into the understanding of how species evolve.

2. **Key Concepts**:
- **Natural Selection**: This is the process where organisms better adapted to their environment tend to survive and produce more offspring.
- **Mutation**: This refers to changes in the DNA sequence of an organism's genome. Mutations can introduce new traits into a population.

3. **Combining Concepts**: Neo-Darwinism posits that new species arise through the combination of mutations that introduce new genetic variations and natural selection that favors those variations that are advantageous for survival.

4. **Evaluating Options**:
- **Option 1: Mutation with Natural Selection**: This aligns with the principles of Neo-Darwinism, as it combines both mutation and natural selection.
- **Option 2: Continuous Variation with Natural Selection**: While continuous variation is important, it does not specifically address the role of mutations.
- **Option 3: Hybridization**: This involves the interbreeding of different species, which is not the primary mechanism described in Neo-Darwinism.
- **Option 4: Mutation**: While mutations are important, this option does not include the natural selection aspect, which is crucial in Neo-Darwinism.

5. **Conclusion**: Based on the evaluation, the correct answer is **Mutation with Natural Selection**. This reflects the Neo-Darwinian view that new species develop through the interplay of genetic mutations and the process of natural selection.

### Final Answer:
**Neo-Darwinism believes that new species develop through mutation with natural selection.**