How Does Evolution Affect The Environment

A dog, cat, and any other mammal you see today have a common ancestor with you and other humans. Scientists believe that evolution took place and can be proven through the homologous structures of prehistoric/modern whales and other mammals and DNA comparisons between species of mammals.
The advancement of the whale species and their bone structures is an example of how evolution takes place in mammals. From the film “Morphed: When Whales Had Legs,” I took notes of how prehistoric whale species adapted to their environment and evolved. The film said that climate change affected the environment around the Pakicetus, a pre-whale species. Because of the climate change, the food provided from the environment was decreasing, so the Pakicetus had to move to the water. Over time however, the Pakicetus began to adapt to the underwater environment. In other words, early whale species were forced to adapt to a different environment. Their bone structures started to change, so they could adapt to the water. For …show more content…
From the “Homologous Structure Comparison” activity, I observed a picture that shows the bone structures of a human’s arm, a bird’s arm, and a bat’s arm. The bones of the arms looked similar and even have the same features, just in different shapes and sizes. The arms from the bird and the bat both have a hand that is spread out, while the hand from a human arm is structured much closer. This means that homologous structures of mammals are similar. They have the same features, but have different traits and are used for different purposes. Birds and bats use their spread out hands for flying or gliding, while humans use their hands for grabbing. This is important because even though their bone structures look different and have different functions, they have the same key features and look similar in a way. Therefore, they share a common