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Are the extraembryonic membranes the same in all vertebrates?
The presence of each extraembryonic membrane varies according to the vertebrate class.
In fishes and amphibians only the yolk sac is present. In reptiles and birds besides the yolk sac there are also the amnion, the chorion and the allantois. In placental mammals besides all these membranes the placenta is present too.
Five Kingdom Classifications Biology, as you know, is the study of life, living things, and their relationship to one another and to their environment. This branch of Science
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Primary Tubercle (Ghon Tubercle): When an individual with no previous exposure to tuberclosis inhale a sufficient number of tubercle bacilli into the alveoli, tubercu
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