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Trilobites like Cryptolithus and Phacops dominated this geologic Era
corals
mammals
birds and graptolites
99.9% are extinct
they were alive for too long on the Earth
Stromatolites
dinosaurs
Paleozoic
Which of the following groups of organism NEVER lived on Earth at the same time?
corals
mammals
birds and graptolites
99.9% are extinct
they were alive for too long on the Earth
Stromatolites
dinosaurs
Paleozoic
The group of animals dominating the most current geologic Era are
corals
mammals
birds and graptolites
99.9% are extinct
they were alive for too long on the Earth
Stromatolites
dinosaurs
Paleozoic
Pleurodictyum belongs to this group of organisms
corals
mammals
birds and graptolites
99.9% are extinct
they were alive for too long on the Earth
Stromatolites
dinosaurs
Paleozoic
This group of organisms went extinct 65 million years ago
corals
mammals
birds and graptolites
99.9% are extinct
they were alive for too long on the Earth
Stromatolites
dinosaurs
Paleozoic
Which photosynthetic organism changed the atmosphere during the PreCambrian?
corals
mammals
birds and graptolites
99.9% are extinct
they were alive for too long on the Earth
Stromatolites
dinosaurs
Paleozoic
Of all the species that once roamed Earth...
corals
mammals
birds and graptolites
99.9% are extinct
they were alive for too long on the Earth
Stromatolites
dinosaurs
Paleozoic
Brachiopods are not good index fossils because
corals
mammals
birds and graptolites
99.9% are extinct
they were alive for too long on the Earth
Stromatolites
dinosaurs
Paleozoic
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