Things of the same species have similar morphology and can reproduce to create viable offspring.

Here's why:

* Morphology: This refers to the physical structure and form of an organism. Members of the same species generally share a similar body plan, features, and characteristics.

* Reproduction: The ability to reproduce and produce fertile offspring is the defining characteristic of a species. This means that two individuals of the same species can mate and produce offspring that are also capable of reproducing.

Let me know if you'd like to explore other aspects of species!