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17-1,2,3 quiz part 2

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A	B
petrified	bones and hard structures replaced by minerals
mold	empty space left as organism decays
cast	replica or organism formed when mold is filled in
imprint	living material falls into sediment, covered quickly, forms impression
trace	footprints, trails or burrows
in amber or ice	entire organism trapped
Precambrian	oldest organisms appeared here
Cenozoic	shortest era, we are in it now
Paleozoic	consists of 6 periods, much marine life present
Mesozoic	Age of dinosaurs, more mammals and modern birds appeared

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