Human evolution: began with origin of cellular life 3. 8 billion years ago, mainly unicellular life, focus on portion of history where mammals were present, cambrian explosion, many different species appear. Precambrian supereon, phanerozoic eon, paleozoic, mesozoic, cenoszoic (age of mammals) Mammals and angiosperms (flowering plants: first appeared in mesozoic era (age of reptiles, most extent mammals diversified in cenozoic era. Cenozoic era (65 mya - present: saw radiation of mammals + extinction of dinosaur, coupled in time + linked with diversification of angiosperm plants. Vascular plant that have flowers: most endosperm within the seeds, most produce fruit that contain seeds. Most diverse group of land plants now. Difference between plants with seeds and plants without seeds. Seeds are an innvoation: evolved in ancestor of gymnosperm + angiosperm plants. Saturday, february 11, 2017: before seeds evolved, all plants sued spores, spores, have little stored food resources as compared to seeds.