8th grade mr. Hardy

Question Answer
Cenozoic era Era of recent life that began about 66 million years ago and continues today includes the first appearance of Homo sapiens
Cyanobacteria Chlorophyll containing photosynthetic bacteria thought to be one of earths earliest life forms
Mesozoic era Middle era of earths history during which Pangea broke apart dinosaur appeared and reptile and gymnosperms were the dominant land life forms
Paleozoic era Era of ancient life which begins about 544 million years ago when organisms developed hard parts and ended with mass extinctions about 254 million years
Precambrian time Longest part of earths history lasting from 4 billion years ago

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