Evidence of Evolution worksheet 20 points Background When Charles Darwin first proposed the idea that all new species descend from an ancestor, he performed an exhaustive amount of research to provide as much evidence as possible. Today, the major pieces of evidence for this theory can be broken down into the fossil record, embryology, comparative anatomy, and molecular biology. Fossils This is a series of skulls and front leg fossils of organisms believed to be ancestors of the modern-day horse. Equus (modern horse) Pilohippus Merychippus Mesohippus Eohippus (Dawn Horse) 1. Give two similarities between each of the skulls that might lead to the conclusion that these are all related species. 2. What is the biggest change in skull anatomy that occurred from the dawn horse to the modern horse? 3. What is the biggest change in leg anatomy that occurred from the dawn horse to the modern horse? Embryology Organisms that are closely related may also have physical similarities before they are even born! Take a look at the six different embryos below: A B C D E F Hypothesize which embryo is from each of the following organisms: Species Embryo Hamaan Chicken Rabbit Tortoise Salamander Fish These are older, more developed embryos from the same organisms. 119999 A B C Hypothesize which embryo is from each of the following organisms: Species Human Chicken Rabbit Tortoise Salamander Fish These are embryos at their most advanced stage, shortly before birth. Embryo Comparative Anatomy Shown below are images of the skeletal structure of the front limbs of 6 animals: human, crocodile, whale, cat, bird, and bat. Each animal has a similar set of bones. Color code each of the bones according to this key: Humerus Ulna Radius humena radiu -carpal phalanges human Dat Carpals 11 Metacarpals Phalanges -ulna whale crocodie For each animal, indicate what type of movement each limb is responsible for. Page 4

Evidence of Evolution Worksheet

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