What are the theories of how life on earth began?

• In layers of rock.

• In hot boiling water around hydrothermal vents in the bottom of the ocean.

• In slimy, porous rock faces whre the sea water laps against the shore.

• From comets, metorites, and asteroids.

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NGSS.HS-ESS1-6

Scientists that deal with prehistoric life forms through the study of fossils.

• Biologists

• Paleontologists

• Geologists

• Astrologists

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NGSS.MS-LS4-1

NGSS.MS-LS4-2

Paleontologists found _______ showing remains of algae and photosynthetic organisms.

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NGSS.MS-LS1-6

__________ analysis allows scientists to find living links to ancient organisms.

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NGSS.MS-LS4-1

NGSS.MS-LS4-2

NGSS.MS-LS4-3

The first invertebrates appeared during the _____ period.

• Ordovician

• Devonian

• Triassic

• Cretaceous

The first birds and mammals appeared during the ______ period. Dinosaurs also became abudant during this time.

• Permian

• Jurassic

• Triassic

• Cretaceous

_______ is believed to be the ancestor to modern birds.

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NGSS.MS-LS4-1

NGSS.MS-LS4-2

Placental animals evolved _______ million years ago.

• 20-40

• 40-70

• 150-200

• 200-230

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NGSS.MS-LS4-1

NGSS.MS-LS4-2

_______ is the classification of organisms.

____ are bacterial organisms that lack a true nucleus and reproduce through binary fission.

• Protista

• Plantae

• Monera

• Animalia