It's impossible to say who was the first person to discover organisms, as the concept of "organism" itself is a complex one that developed over time. Early humans certainly observed and interacted with living things, but they wouldn't have had the scientific framework to define or name them as we do today.

Here's a breakdown of how our understanding of organisms evolved:

* Prehistoric times: Early humans were acutely aware of the natural world and its inhabitants. They relied on plants and animals for sustenance, and they likely had basic knowledge of their behavior and properties.

* Ancient civilizations: Philosophers like Aristotle (4th century BC) started classifying living things into categories based on their observable characteristics. This marked the beginning of systematic observation and categorization.

* The Renaissance and beyond: The invention of the microscope in the 17th century allowed scientists like Antonie van Leeuwenhoek to see microorganisms for the first time. This opened up a whole new world of life that was previously invisible to the naked eye.

* The birth of biology: Over time, the study of living things became more organized and scientific. The concept of the "cell" as the fundamental unit of life was established, and the field of biology emerged as a distinct discipline.

Therefore, it's more accurate to say that our understanding of organisms evolved gradually over centuries, thanks to the contributions of many individuals and the development of scientific tools and methods. No single person can be credited with the "discovery" of organisms, as it was a process of ongoing investigation and refinement.