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therapsids

an extinct group of reptiles from which mammals evolved

mammary glands

glands that make a nutritious fluid for embryos called milk

incisors

teeth used to cut food

canines

teeth used to stab and slice teeth

molars

teeth used to grind up food

milk teeth

a young mammal's first small teeth

diaphragm

a large muscle in mammals that helps bring air into the lungs

monotremes

mammals that lay eggs

marsipials

mammals with pouches in which the young go in for protection

placental mammals

Mammals that have embryos that develop in mother's uterus until its body systems can function independently

gestation period

time in which embryo develops within the mother

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