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Charles Darwin's Theory Of Evolution Through Peacocks, Gobies, And Mice

717 words - 3 pages

Have you ever heard of a British scientist named Charles Darwin? He is the one who developed the theory of evolution. He also had a little motto, “survival of the fittest”, which means that natural selection chooses those best adapted to their environment to live. Those who survive reproduce and have new babies with the gene to survive in the environment, unless something changes. With that mentioned, certain traits are more common in a population because the traits increase an individual’s probability of surviving and reproducing in its environment. Evidence includes male peacocks with their colorful tails, Hawaii climbing gobies, and rock pocket mice.
Charles Darwin wondered why male peacocks had such beautiful, flamboyant tails, if that made running and escaping predators harder. Darwin later figured out that male peacocks had such large and beautiful tails to help attract a mate, the peahens. The peahens choose mates with the most colorful and noticeable feathers. The father can pass down his beautiful tail genes to his children, which might one day have children and pass that down. Over time, through mutations (changes in DNA), the tails will get fancier and eventually, more peacocks will attract more peahen mates with their fancy tails. In the end, the peacock and peahen population will still get larger, even if predators devour a few, due to the fanciness of the males’ tails, which helps attract more mates to reproduce.
Hawaii climbing gobies are small fish, trying to survive and avoid predators, such as larger fish. To help them be able to do this, they have a trait, suited to their environment; size. Short/squat goby fish have bodies that are built for speed. That makes them better suited for swimming quickly up streams and strong currents. However, its small size make it more difficult to climb up waterfalls. This makes them better adapted to environments with long streams and short waterfalls. Tall goby fish are made better for climbing waterfalls, but are slower. This type of climbing goby is better suited for short streams and long waterfalls. How do they pass on the trait? Both types of climbing goby fish have...

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