Getting to know the number and pattern of bones in limbs is important to understand the evolution of tetrapods.
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Fossils are animal and vegetable rests found in different strata of sedimentary rocks. Sedimentary layers deposit chronologically, so they are used to reflect history. These fossils turn to be very useful while dating ages and studing evolutive processes.
Fossils provide good information about the existing relationship between ancient and modern tetrapods. Limb structures between these organisms are relatively similar. However, they can change in the number of bones and their arrangement pattern, reflecting the changes that species suffered through evolution.
The pattern in which the composing bones are arranged in limbs is useful to study tetrapods evolution, from a common aquatic ancient -fish- to modern terrestrial and aquatic tetrapods.
By looking at the number of limbs and digits, and the bones' pattern involved in these structures, scientists could interpret how evolutive processes occurred. Information about bones' density, length, and size, is also useful to understand the environmental pressures acting on the animals, and how the tetrapods managed to adapt.
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