Lecture 13- Mammals, Adaptive Radiation

Lecture 13- Mammals, Adaptive Radiation - Lecture 13-...

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Lecture 13- Adaptive Radiation of Mammals Some Diagnostic Features of Mammals Mammary glands - Energy-rich milk (fats, sugars, proteins, vitamins and minerals) Endothermy - Breakdown of food using a catabolic reaction, produces energy for organism, some lost as heat - Regulation of temperature to ensure normal body processes and working organs - An adaptive trait; influenced by factors such as body size, food habits, climate - Allows organisms to rely less on environmental temperatures as reptiles do, and so they can live in colder/shady environments Diaphragm - A sheet of muscle separating the thorax and abdomen of mammals - Efficient air pumping system for the respiratory system Vipiary- Placenta - The ability to give birth to live young - The placenta is an organ specialized to deliver oxygen and nutrients to young while in the uterus, protects the young before birth from most substances Two occipital condyles - Where spinal cord attaches to the skull Three auditory ossicles: malleus, incus, stapes - Three auditory bones instead of the one that reptiles have allows for excellent hearing abilities for hunting and staying safe Dentary- squamosal joint - Where jaw meets skull, allows for precise and effective biting
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Lecture 13- Mammals, Adaptive Radiation - Lecture 13-...

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