biology 2 chapter 6.1 0.0 / 5 ? BiologyMedicine and drugsGCSEAQA Created by: chloesheehanCreated on: 27-10-13 13:08 HOW OLD IS THE EARTH 4.5 BILLION YEARS 1 of 7 WHEN DO WE THINK LIFE ON EARTH BEGAN 3.5 BILLION YEARS 2 of 7 HOW ARE FOSSILS DATED ITS POSSIBLE TO DATE ROCKS SO THEREFORE POSSIBLE TO DATE FOSSILS 3 of 7 WHY ARE THERE NO FOSSILS OF EARLY LIFE FORMS EARLY LIFE FORMS HAD SOFT BODIES 4 of 7 HOW MIGHT A COMPETITOR CAUSE THE EXTINCTION OF A SPECIES THE ORIGINAL SPECIES MAY BE LEFT WITH TOO LITTLE TO EAT 5 of 7 SUGGEST 2 WAYS THAT PEOPLE CAN CAUSE THE EXTINCTION OF SOME SPECIES HUNTING THEM FOR FOOD, POLLUTING THE ENVIRONMENT 6 of 7 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 7 of 7
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