biology 2 chapter 6.1

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HOW OLD IS THE EARTH
4.5 BILLION YEARS
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WHEN DO WE THINK LIFE ON EARTH BEGAN
3.5 BILLION YEARS
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HOW ARE FOSSILS DATED
ITS POSSIBLE TO DATE ROCKS SO THEREFORE POSSIBLE TO DATE FOSSILS
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WHY ARE THERE NO FOSSILS OF EARLY LIFE FORMS
EARLY LIFE FORMS HAD SOFT BODIES
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HOW MIGHT A COMPETITOR CAUSE THE EXTINCTION OF A SPECIES
THE ORIGINAL SPECIES MAY BE LEFT WITH TOO LITTLE TO EAT
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SUGGEST 2 WAYS THAT PEOPLE CAN CAUSE THE EXTINCTION OF SOME SPECIES
HUNTING THEM FOR FOOD, POLLUTING THE ENVIRONMENT
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WHAT ARE THE 2 MAIN IDEAS PUT FORWARD FOR THE EXTINCTION OF DINOSAURS
A GIANT ASTEROID COLLIDING WITH EARTH, DUE TO THE SEA AND ICE CAPS MELTING
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Card 2

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WHEN DO WE THINK LIFE ON EARTH BEGAN

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3.5 BILLION YEARS

Card 3

Front

HOW ARE FOSSILS DATED

Back

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Card 4

Front

WHY ARE THERE NO FOSSILS OF EARLY LIFE FORMS

Back

Preview of the front of card 4

Card 5

Front

HOW MIGHT A COMPETITOR CAUSE THE EXTINCTION OF A SPECIES

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