Biology Chapter 17-4

Biology Chapter 17-4 - 1 Chapter 17 Section 4 Placental...

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Chapter 17 Section 4 - Placental Mammals Mammals are divided into 3 groups based on how they develop. The groups are: placental - most common monotremes marsupials A placental mammal embryos develop inside the mother’s body. The organ is called the uterus . The placenta attaches the embryo to the uterus. The placenta carries food and oxygen from the mother’s blood to the embryo, and carries wastes away from the embryo. This is done thorough the umbilical cord . The time in which an embryo develops within the mother is called a gestation period . This time varies with each animal. In humans, the gestation period is about 9 months. mouse - 20 days dog - 60 days elephant - 22 months 1
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Placental mammals are divided into 18 orders. What is the 7 levels of classifications? Kingdom Phylum Class Order Family Genus Species K ing P hillip C ame O ver F or G ood S oup. Anteaters, Armadillos, Sloths eat insects with sticky tongue.
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This note was uploaded on 12/15/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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Biology Chapter 17-4 - 1 Chapter 17 Section 4 Placental...

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