Evidence of evolution worksheet

Human: Developed limbs, defined features in face, neck, ears, loss of tail, tiny fingers present

Chicken: Developed beak, tail shorter, wings and legs developed, head quite large

Rabbit: Tail gone, developed limbs, detailed features in ears and mouth

Tortoise: Shell developed, limbs have developed, tail is thinner, large belly, long tail, beak

Salamander: Has gills, tail and large underbelly

Fish: fins developed, gills, tail and scales

1. Same basic shape, circular spots (eyes) and underbelly, all have tails, tiny bumps on underside, hole for ear

2. Examination of vertebrate embryos reveals that during corresponding stages of early development, the embryos appear to be very similar. For example, all vertebrate embryos pass through stages in which they have gill pouches. The pouches eventually develop into the gill apparatus in fish; in laterevolving vertebrates that do not have gills, the gill pouches undergo further refinement and develop into structures associated with the head and neck. Similarly, all early vertebrate embryos have tails, which persist in some animals but regress during the later stages of development of humans. Thus, the individual development of an animal occurs through a series of stages that paint a broad picture of the evolutionary stages (phylogeny) of the species to which it belongs. "Ontogeny recapitulates Phylogeny", Haeckel

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