Module 5 Flashcards by Katya Krueger | Brainscape

Q

How many known species

A

1.5 million

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Q

How many suspected species?

A

10.9 million

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Q

When did earth form

A

4.6 billion years ago

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Q

Why was earth first inhospitable

A

surface was molten larva
bombardment by meteors and lightning
volcanoes released gas (mostly N)
first 1/2 years too hot for water

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