REN R205 Quiz: Lab 3 REN R 205 Quiz prep
6 Apr 2016
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Document Summary
Pelycosaur: ancient group of mammal-like repiles from which mammals evolved. Separaion of middle body by a diaphragm: thorax contains heart and lungs, abdomen contains the stomach, intesines, etc. Mammals have a large, unique midbrain (associated with sight and hearing) 3 major groups of mammals: monotremes (i. e. platypus, spiny anteater) Only found in oceania (australia and papua new guinea: marsupials (i. e. kanaroo, opossum) Live birth of under-developed young that inish developing in the pouch (where the mammary glands are: placental mammals (most na mammals) Young are born at a more developed stage-no pouch! Represented by the marsupials- mammals with a pouch . Young are iny at birth, liters are always <1% the weight of the mother. Maximum # of incisors is 5/4 (top/botom), refers to pairs of teeth: compared to 3/3 in placental mammals. 5 upper and 4 lower pairs of incisors. Family soricidae shrews acive day and night and must eat constantly pointed stout.
