Natural selection and speciation: 'Ecological speciation'.
Natural selection is generally recognized as a central mechanism of evolutionary change within species. ... Thus, the populations cease exchanging genes, thereby diverging into separate species because of the adaptive changes that occurred via natural selection.
In 1609, using this early version of the telescope, Galileo became the first person to record observations of the sky made with the help of a telescope. He soon made his first astronomical discovery.
