How are mammals more advanced than other vertebrates
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Mammals evolved from synapsid reptiles some time in the early Mesozoic, or possibly earlier. The synapsids date from the Permian and seem to have been developing features that we see in fossils and can associate with mammals today. We’re limited to what we can see in fossils, namely hard tissue features like teeth and bones. Soft tissue features are extraordinarily rare, so typically mammalian features such as hair, mammae and other skin glands, a well developed diaphragm and the like are absent from evidence of these early mammals.
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Mammals and birds independently evolved Endothermy: you need a lot more food and have a much more dynamic body. Dinosaurs, now confirmed as ancestral to birds, may have the same.
Mammals have hair. But so do birds, and also feathers which are more sophisticated.
Mammals have deficient colour vision. Land vertebrates had excellent four-colour vision. Mammals lost this, probably when nocturnal. Primates partly restored this, being able to see red, ripe fruit.
Mammals have a Middle Ear based on three little bones, originally part of the jaw. Shared with some extinct relatives.
Mammary glands are modified and enlarged sweat glands consisting of ducts and glandular tissues that secrete milk through nipples; the milk provides young with much-needed proteins, sugars, fats, vitamins, and salts.
Mammals have hair. But so do birds, and also feathers which are more sophisticated.
Mammals have deficient colour vision. Land vertebrates had excellent four-colour vision. Mammals lost this, probably when nocturnal. Primates partly restored this, being able to see red, ripe fruit.
Mammals have a Middle Ear based on three little bones, originally part of the jaw. Shared with some extinct relatives.
Mammary glands are modified and enlarged sweat glands consisting of ducts and glandular tissues that secrete milk through nipples; the milk provides young with much-needed proteins, sugars, fats, vitamins, and salts.
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Mammals and birds independently evolved Endothermy: you need a lot more food and have a much more dynamic body. Dinosaurs, now confirmed as ancestral to birds, may have the same.
Mammals have hair. But so do birds, and also feathers which are more sophisticated.
Mammals have a Middle Ear based on three little bones, originally part of the jaw. Shared with some extinct relatives.
Mammary glands are modified and enlarged sweat glands consisting of ducts and glandular tissues that secrete milk through nipples; the milk provides young with much-needed proteins, sugars, fats, vitamins, and salts.
Mammals have hair. But so do birds, and also feathers which are more sophisticated.
Mammals have deficient colour vision. Land vertebrates had excellent four-colour vision. Mammals lost this, probably when nocturnal. Primates partly restored this, being able to see red, ripe fruit.
Mammals have hair. But so do birds, and also feathers which are more sophisticated.
Mammals have a Middle Ear based on three little bones, originally part of the jaw. Shared with some extinct relatives.
Mammary glands are modified and enlarged sweat glands consisting of ducts and glandular tissues that secrete milk through nipples; the milk provides young with much-needed proteins, sugars, fats, vitamins, and salts.
Mammals have hair. But so do birds, and also feathers which are more sophisticated.
Mammals have deficient colour vision. Land vertebrates had excellent four-colour vision. Mammals lost this, probably when nocturnal. Primates partly restored this, being able to see red, ripe fruit.
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