Why Is Evolution Theory Incomplete?


Jane Flores

Evolution theory is a fundamental concept in biology that explains how species change over time. It is based on the idea that all living organisms share a common ancestor and have evolved through the process of natural selection.

However, despite being widely accepted, evolution theory is still considered incomplete by many scientists and researchers. In this article, we will explore some of the reasons why evolution theory is still incomplete.

The Missing Pieces

One of the main reasons why evolution theory is incomplete is due to the missing pieces in the fossil record. Fossils are important records of past life forms and provide valuable information about how organisms have evolved over time. However, there are many gaps in the fossil record that make it difficult to fully understand how certain species evolved.

The Problem with Transitional Forms

One of the biggest challenges in understanding evolution is identifying transitional forms – organisms that show characteristics of both their ancestral and descendant groups. These forms are crucial in determining how one species evolved into another, but they are often missing from the fossil record.

The Role of Genetics

Another area where evolution theory falls short is in its understanding of genetics. While genetics plays a major role in determining an organism’s traits and characteristics, it was not fully understood during Darwin’s time when he first proposed his theory. Today, with advancements in genetic research and technology, we have a much better understanding of how genes work and how they contribute to evolutionary processes.

The Limits of Natural Selection

Natural selection is a key component of evolution theory that describes how certain traits become more or less common within a population over time. However, natural selection has its limits and cannot explain every aspect of evolutionary change.

Non-Adaptive Evolutionary Changes

One limitation of natural selection is its inability to account for non-adaptive evolutionary changes – changes that occur without any selective advantage. For example, some species may experience genetic drift, where certain traits become more or less common due to random chance rather than selective advantage.

The Influence of Environmental Factors

Another limitation of natural selection is its inability to account for the influence of environmental factors on evolutionary change. Environmental factors such as climate change, habitat loss, and human intervention can have a significant impact on an organism’s evolution, yet these factors are not always accounted for in traditional evolutionary models.

The Future of Evolutionary Theory

Despite its limitations and incompleteness, evolution theory remains one of the most important and widely accepted scientific theories. However, as our understanding of genetics and other areas of biology continues to grow, it is likely that new theories and models will emerge to further refine and expand upon current evolutionary theory.


In conclusion, while evolution theory has come a long way since its inception in the 19th century, it is still considered incomplete by many scientists. The missing pieces in the fossil record, limitations of natural selection, and our evolving understanding of genetics are just a few reasons why we still have much to learn about how species evolve over time. Nevertheless, ongoing research and advancements in technology provide hope for a more complete understanding of this fundamental aspect of biology.