Question

After Darwin proposed his ideas about natural selection as a mechanism for evolution, it took time before evolution was generally considered a theory. Why do we now refer to it as a theory?

Answer 1

The theory of evolution by natural selection is considered a theory because it is extensively tested and supported by scientific evidence from various fields. Fossils, genetics, and comparative anatomy all provide evidence for evolution. A scientific theory is not a guess but a well-substantiated explanation based on evidence.

Step-by-step explanation:

The theory of evolution by natural selection is considered a theory because it has been extensively tested and supported by a wide range of scientific evidence. A theory in science is an explanation derived from several areas of investigation and a substantial body of evidence. The theory of evolution by natural selection has been validated through various fields of study, including palaeontology, genetics, and comparative anatomy.

Scientists have discovered numerous fossils that provide a record of species that lived in the past, showing clear evidence of changes over time. The study of genetics has also provided evidence for evolution, as shared DNA sequences and genetic variation among species support the idea of common ancestry. Additionally, comparative anatomy - the study of similarities and differences in the structure of different organisms - demonstrates patterns of similarities that can be explained by evolution.

It is important to note that in scientific terminology, a theory is not simply a guess or speculation. It is a well-substantiated explanation that incorporates a wide range of evidence and has undergone rigorous testing and scrutiny. The theory of evolution by natural selection is supported by a vast amount of scientific research and is considered one of the foundational principles of biology.

Answer 2

A scientific theory refers to the possible explanation of the natural event. It can be tested repeatedly and can be verified by anyone with the help of predefined sets of protocols and scientific experimentation.

Similarly, Darwin proposed the idea of natural selection as the mechanism of evolution.

Various experiments in labs, as well as observations made under natural conditions, proved that natural selection plays a major role in the evolution.

Examples may include industrial melanism of peppered moths, long neck of Giraffe, different shapes and sizes of beaks of Darwin finches et cetera.

This is why natural selection is considered a theory now.