Early earth history

What were some of the earliest forms of life on Earth?

• Fish

• Cyanobacteria

• Dinosaurs

• Frogs

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NGSS.MS-LS4-1

NGSS.MS-LS4-2

Cyanobacteria increased the levels of carbon dioxide in the atmosphere.

• True

• False

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NGSS.MS-ESS2-1

NGSS.MS-LS2-3

What is the evidence for the endosymbiotic theory? (Why do scientists think two of the organelles were originally bacteria cells)

• the organelles look like prokaryotes

• the organelles each have their own DNA

• all of the above

• they make/use their own energy molecules: one can use oxygen to make energy and the other uses photosynthesis (sunlight) to make energy.

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NGSS.HS-LS2-5

In the endosymbiotic theory

• prokaryotic cells were ingested by larger eukaryotic cells
• eukaryotic cells were ingested by larger prokaryotic cells
• prokaryotic cells became eukaryotic cells
• eukaryotic cells became prokaryotic cells.

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NGSS.MS-LS4-2

What were the first cells in the early earth?

• prokaryotic cells
• eukaryotic cells

There was very little __________ in the early atmosphere

• oxygen
• carbon dioxide
• water vapor
• iron

The atmosphere of the early earth had a lot of

• carbon dioxide

• nitrogen

• oxygen

• carbon dioxide and water vapor

Around 2.2 billion years ago, bacteria started producing ________ by photosynthesis.

• oxygen
• nitrogen
• carbon dioxide
• iron oxide

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NGSS.MS-LS1-6

I like fossils

• yes

• no

• huh??

• what are fossils??

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

What was the Earth's early atmosphere like ?

• A large amount of carbon dioxide,little or no oxygen

• A large amount of oxygen, sodium and hydrogen.

• A large amount of hydrogen and helium.

• A large amount of nitrogen.

Tags

NGSS.HS-ESS1-6

NGSS.HS-ESS2-4