Long paragraph:
There is a wealth of scientific evidence supporting the theory of evolution. One of the key pieces of evidence is the fossil record, which shows the gradual changes and developments in the forms of life on Earth over time. Another important piece of evidence is the similarity of the structures and functions of different organisms, which suggests that they have evolved from common ancestors. For example, the bones in the forelimbs of humans, birds, and bats are all similar in structure, despite the fact that they are used for different purposes, indicating that they have a shared evolutionary history. Additionally, the existence of vestigial structures, such as the wings of flightless birds, also supports the idea of evolution. Overall, the evidence for evolution is compelling and continues to be supported by new scientific discoveries.
Short paragraph:
The theory of evolution is supported by a wealth of scientific evidence, including the fossil record, the similarity of structures and functions in different organisms, and the existence of vestigial structures. This evidence shows the gradual changes and developments in the forms of life on Earth over time, and it continues to be supported by new discoveries.