The unit that includes only organisms that interbreed and live in the same place at the same time is called a **population**. Here's why:
1. **Population Definition**: A population consists of all the individuals of a particular species that live in the same geographical area and are capable of interbreeding. This means that they can mate with one another to produce offspring.
2. **Interbreeding**: In a population, organisms are able to interbreed because they share the same gene pool. This genetic similarity allows them to reproduce and maintain the population's genetic diversity.
3. **Living in the Same Place and Time**: Members of a population live in the same habitat or geographical area at the same time. This proximity enables them to interact, compete for resources, and potentially mate with one another.
Therefore, a population is the unit that includes only organisms that interbreed and live in the same place at the same time. It is a fundamental concept in ecology and evolutionary biology for understanding how species interact and evolve within a specific environment.
