Why Is Evolution a Theory Quizlet?


Diego Sanchez

Evolution is a widely accepted scientific theory that explains the diversity of life on Earth. Despite the overwhelming evidence supporting it, some people still question its validity.

One such platform where this question is often asked is Quizlet. In this article, we will explore why evolution is a theory on Quizlet.

What is a Scientific Theory?

Before diving into why evolution is a theory, it’s essential to understand what a scientific theory is. A theory in science refers to an explanation supported by extensive evidence and experimentation. Theories are not mere guesses or assumptions but are based on observable facts and tested hypotheses.

Why Is Evolution a Theory?

Evolution, like other scientific theories such as gravity and germ theory, meets all the criteria of a scientific theory. It has been tested through numerous experiments and observations from various fields such as biology, paleontology, genetics, and more.

One of the primary pieces of evidence supporting evolution is the fossil record. Fossils are the remains of ancient organisms preserved in rocks over millions of years. By studying these fossils, scientists have been able to trace the evolutionary history of life on Earth and how different species evolved over time.

Another piece of evidence supporting evolution is comparative anatomy. The study of the anatomical similarities and differences between different species provides strong evidence for their evolutionary relationships. For example, humans share similar bone structure with other primates such as chimpanzees and gorillas, indicating that we share a common ancestor.

Genetics also supports the theory of evolution. By analyzing DNA sequences in different species, scientists can determine how closely related they are and how they evolved over time.

The Difference between a Scientific Theory and Hypothesis

It’s important to note that a scientific theory is not the same as a hypothesis. A hypothesis refers to an educated guess that has not yet been tested extensively or supported by substantial evidence. In contrast, a theory has been rigorously tested and supported by extensive evidence.


In conclusion, evolution is a theory on Quizlet because it meets all the criteria of a scientific theory. It has been tested extensively through various experiments and observations from different fields, providing overwhelming evidence supporting its validity. As with any scientific theory, new evidence may emerge that could challenge or modify it, but for now, evolution remains one of the most well-supported scientific theories.