Two species can be said to be reproductively isolated if they are

Options

A. Interfertile
B. Not interfertile
C. Do not grow together in a common habitat
D. Growing together in a common habitat

Answer

**Step-by-Step Solution:**

1. **Understanding Reproductive Isolation**: Reproductive isolation is a biological concept that refers to the mechanisms that prevent different species from interbreeding. This ensures that species remain distinct and do not mix their genetic material.

2. **Types of Reproductive Isolation**: There are various forms of reproductive isolation, which can be categorized into prezygotic and postzygotic barriers. Prezygotic barriers prevent mating or fertilization between species, while postzygotic barriers occur after fertilization.

3. **Analyzing the Options**:
- **Interfertile**: If two species are interfertile, they can breed and produce viable offspring, which means they are not reproductively isolated.
- **Non-interfertile**: If two species are non-interfertile, they cannot breed and produce viable offspring, indicating reproductive isolation.
- **Do not grow together in a common habitat**: If two species do not share the same habitat, they are less likely to encounter each other and thus are likely to be reproductively isolated.
- **Growing together in a common habitat**: If two species grow together, they may have the opportunity to interbreed, which would mean they are not reproductively isolated.

4. **Conclusion**: Based on the analysis, two species can be said to be reproductively isolated if they are non-interfertile or do not grow together in a common habitat. The most definitive answer is that they do not grow together in a common habitat, as this indicates a clear separation that prevents interbreeding.

**Final Answer**: Two species can be said to be reproductively isolated if they do not grow together in a common habitat.

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