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means recent life - age of mammals

adaptations that helped mammals survive

warm-blooded, efficient hears & lungs, insulating body hair, specialized teeth

Tertiary Period

mountain building, climate change, mammals became widespread,

Quaternary period

humans developed advance & retreat of continental glaciers

Milankovitch cycles

Changes in the shape earth's orbit and tilt that cause glacial periods and interglacial periods.

large mammals that later became extinct

Mastadons, Mammoths, ground sloths, saber toothed cats, giant beavers, bison, wolves, bears

Homo sapiens

modern humans evolved over 100,000 years ago in Africa

land bridge

may have helped humans migrate from Asia to N America about 14,000 years ago

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