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Q. Do all mammals have a placenta?
Mammals of the monotreme group (platypus, echidnas) are oviparous egg- laying and they don't have a placenta. Mammals of the marsupial group (koalas, kangaroos, opossums) do not have a placenta either females of this group give birth to embryonic young that then continue development within the mother's pouch, placenta only forms in female placental mammals.
Q. What are the Signs used in acute pericarditis? • Pericardial friction rub is pathognomonic of pericarditis. It is heard as a phasic scatching sound. It may vary with phases
When a ventricQlar septa1 defect (VSD) is present, with no aortic stenosis, the peak velocitgr across the defect reflects the difference in pressure between the right ventricle an
Epimorphic Regeneration In this sort of regeneration the lost part is reformed and restored via the growth of a bud or blastema from the remaining part of the organism followe
WHY OBELIA IS OF SPECIAL INTEREST IN ZOOLOGY
Mixotrophic nutrition
In this section we are to discuss the means by which populations get separated or isolated from each other, first gain the status of'Sub-species and finally evolve mechanisms which
What are the differences between the two domain
Define requirement of energy for Physical activity? This is the most variable and, after BMR, the second largest component of daily energy expenditure. Humans perform obligator
Introduction: There are different technologies available for dealing with waste water management and excreta. Some are suitable for dealing off-site sanitation and other can b
Why is the occurrence of eyelids in amphibians in comparison to their absence in fishes and adaptation to terrestrial life? Eyelids associated to lacrimal glands protect and ke
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