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10 terms

Chapter 32

Chapter 32 - Mammals
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gland
an organ that secretes substances inside or outside the body
mammary glands
lands in female mammals that secrete milk
diaphragm
the sheet of muscle located beneath the lungs
uterus
a hollow, muscular organ in which offspring develop
placental mammal
a mammal that carries its young inside the uterus until development is almost complete
placenta
an organ in the uterus that nourishes the young inside it
gestation
the time during which placental mammals develop inside the uterus
marsupial
a mammal in which the young have a short period of development within the mother's body, followed by a second period of development inside a pouch made of skin and hair
monotreme
a mammal that reproduces by laying eggs
Therapsids
fierce-looking, heavy-set animals that had features of both reptiles and mammals