Final answer:
Charles Darwin began to formulate his concept of evolution during his voyage on the HMS Beagle from 1831 to 1836. He made observations and collected specimens, which led to the development of his theory of evolution by natural selection.
Step-by-step explanation:
Charles Darwin began to formulate his concept of evolution during his voyage on the HMS Beagle, which took place from 1831 to 1836. During this time, Darwin made observations about plants and animals around the world, collecting specimens and studying them. These observations and evidence led Darwin to develop his theory of evolution by natural selection, which he published in his book On the Origin of Species in 1859.