Darwin, Evolution, & Natural Selection (Intro)

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Darwin, Evolution, & Natural Selection (Intro)

  1. 1. Charles Darwin, Evolution, &Natural Selection: An Introduction HMS Beagle
  2. 2. Charles Darwin- Charles Darwin was a British naturalist (someone who studies nature) who worked on a sailing ship named, the Beagle- Darwin observed nature and took notes on everything he saw HMS Beagle
  3. 3. Galapagos Islands- One of the Beagle’s stops was the Galapagos Islands off the coast of South America- Here Darwin observed many new plants and animals
  4. 4. Marine vs. Land Iguanas - Two new animals Darwin saw were marine and land iguanas- Darwin noticed the marine iguanas - Darwin also noticed the landhad long claws and flat noses to help iguanas had short claws which allowthem grip slippery rocks and eat them to climb trees and eat leavesseaweed Land Iguana Marine Iguana
  5. 5. Yummy seaweed…
  6. 6. Darwin’s Finches - Darwin also observed birds called finches- Darwin noticed that some finches had beaks for grabbing insects, some had beaks for crushing seeds, and others had beaks used for poking around in tree bark.
  7. 7. Iguanas & Finches- After observing the iguanas, finches, and many other organisms, Darwin made a very important conclusion…- Darwin concluded that each animal was perfectly adapted to their own particular environment Marine Iguana = adapted for eating seaweed underwater Land Iguana = adapted for eating leaves in trees Finches = beaks adapted to their food source
  8. 8. Adaptation, Natural Selection, Adaptation & Evolution - When animals change in ways that help them to survive it is called an adaptation (ex. long claws, short claws, & special beaks) - Darwin then combined the idea of adaptation with a newer idea called natural selectionNatural Selection - When nature “selects” the animals that are BEST adapted to their environment for survival (ex. nature “selects” the marine iguanas for the ocean because of their long claws – you don’t find short-clawed iguanas in the ocean) - Darwin then created his famous theory of evolution where he explained how evolution happensTheory of Evolution - Evolution, or change over time, occurs through the process of natural selection

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