How Organisms Evolved From a Common Ancestors

1109 Words3 Pages

One of the most important principles of biology is the main idea of evolution. This theory states, “that all living organisms have evolved from a common ancestor through natural selection acting on hereditary variation” (Reece, 2011). Many people today, know humans have evolved from a common ancestor; but they do not recognize the importance of it. Everyone should be educated about how organisms evolved because humans have evolved throughout many centuries. Charles Darwin had many theories that incorporated the main principle of biology, natural selection and evolution. Darwin explained natural selection as an evolutionary change where organisms that become more adapted to their environment will survive better than those who do not (Natural, 2004). Through evolution and natural selection many species, including humans, are here today.

Charles Darwin founded the principle of natural selection, which describes how organisms that adapt better in an environment will survive better and produces more offspring (Natural, 2004). Darwin first noticed evolution after being on the Galápagos Islands; here, he noticed that geological separation played an important role on how organisms adapted and formed new species (College, 2009). When species live in a new environment, they adapt differently and eventually these organisms will change over time, which is known as evolution (College, 2009).

Darwin noticed that birds on a different Galapagos island also have similarities and differences. He believed that these birds were once the same species but because of evolution they became different species. He noticed, “the different species show different beak morphologies (size and shape) that are well suited for exploiting different food resourc...

... middle of paper ...


McCullough, M. E., & Pedersen, E. J. (2013). The Evolution of Generosity: How Natural Selection Builds Devices for Benefit Delivery. Social Research, 80(2), 387-410.

Milot, E., & Pelletier, F. (2013). Human Evolution: New Playgrounds for Natural Selection. Current Biology, (10), doi:10.1016/j.cub.2013.04.040

Natural Selection: How Evolution Works. (2004). Actionbioscience. Retrieved February 26, 2014, from

Natural Selection: How Evolution Works. (n.d.). Actionbioscience. Retrieved March 16, 2014, from

Natural Selection. (n.d.). Evolution 101: How It Works. Retrieved February 26, 2014, from

Reece, J. B., & Campbell, N. A. (2011). Campbell biology Jane B. Reece ... [et al.]. (9th ed.). Boston: Benjamin Cummings.

Open Document