Taxonomically a species is `:-`

Options

A. A group of organisms with fundamental external similarities.
B. A group of individuals capable of interbreeding
C. A group of individuals living together in a habitat.
D. A group of individuals having same morphology only

Explanation

To solve the question "Taxonomically a species is:", we will analyze the provided options and determine which one correctly defines a species.

### Step-by-Step Solution:

1. **Understanding the Definition of a Species**:
- A species is typically defined in biology as a group of organisms that can interbreed and produce fertile offspring. This means that members of the same species share genetic similarities and can reproduce with one another.

2. **Evaluating the Options**:
- **Option A**: A group of organisms with fundamental external similarities.
- This option focuses on morphological similarities, which does not necessarily imply that the organisms can interbreed. Therefore, this option is not correct.

- **Option B**: A group of individuals capable of interbreeding.
- This option aligns with the biological definition of a species. It emphasizes the ability to interbreed and produce fertile offspring, which is a key characteristic of a species. This option is likely correct.

- **Option C**: A group of individuals living together in a habitat.
- While species may inhabit the same environment, this does not define a species. Different species can live in the same habitat, so this option is not correct.

- **Option D**: A group of individuals having the same morphology only.
- Similar morphology does not guarantee that the organisms can interbreed. Therefore, this option is also not correct.

3. **Conclusion**:
- After evaluating all the options, the correct answer is **Option B: A group of individuals capable of interbreeding**. This definition captures the essence of what a species is in taxonomic terms.

### Final Answer:
Taxonomically, a species is a group of individuals capable of interbreeding.