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2. Evolution: The Game of Intelligent Life - Wikipedia

   en.wikipedia.org/wiki/Evolution:_The_Game_of...

   The game starts from basal tetrapods, the very first land dwellers: amphibians. At the gain of the game, each player starts with one population of a species of prehistoric amphibian—e.g. Ichthyostega, Tulerpeton, and Acanthostega. Gradually, if the player monitors the species' progress and moves them to more appropriate habitats and climate ...

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4. Evolution of mammals - Wikipedia

   en.wikipedia.org/wiki/Evolution_of_mammals

   Figure 1:In mammals, the quadrate and articular bones are small and part of the middle ear; the lower jaw consists only of dentary bone.. While living mammal species can be identified by the presence of milk-producing mammary glands in the females, other features are required when classifying fossils, because mammary glands and other soft-tissue features are not visible in fossils.

5. Amniote - Wikipedia

   en.wikipedia.org/wiki/Amniote

   While the early amniotes resembled their amphibian ancestors in many respects, a key difference was the lack of an otic notch at the back margin of the skull roof. In their ancestors, this notch held a spiracle , an unnecessary structure in an animal without an aquatic larval stage. [ 25 ]

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7. Sauropsida - Wikipedia

   en.wikipedia.org/wiki/Sauropsida

   Sauropsida (Greek for "lizard faces") is a clade of amniotes, broadly equivalent to the class Reptilia, though typically used in a broader sense to also include extinct stem-group relatives of modern reptiles and birds (which, as theropod dinosaurs, are nested within reptiles as more closely related to crocodilians than to lizards or turtles). [2]

8. Digitigrade - Wikipedia

   en.wikipedia.org/wiki/Digitigrade

   There are structural differences between the limb anatomy of plantigrades, unguligrades, and digitigrades. Digitigrade and unguligrade animals have relatively long carpals and tarsals, and the bones which correspond to the human ankle are thus set much higher in the limb than in a human. In a digitigrade animal, this effectively lengthens the ...

9. Pain in amphibians - Wikipedia

   en.wikipedia.org/wiki/Pain_in_amphibians

   In evolutionary terms, this means the opioid receptor sub-types are already present in amphibians, although the differences between these are less pronounced than in mammals. [45] Sequence comparisons show that the amphibian opioid receptors are highly conserved (70-84% similar to mammals) and are expressed in the central nervous system (CNS ...