means recent life - age of mammals
adaptations that helped mammals survive
warm-blooded, efficient hears & lungs, insulating body hair, specialized teeth
mountain building, climate change, mammals became widespread,
humans developed advance & retreat of continental glaciers
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
modern humans evolved over 100,000 years ago in Africa
may have helped humans migrate from Asia to N America about 14,000 years ago
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