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1. For how long has there been life on Earth? 2. For what percentage of time has life existed on Earth (round to the nearest whole number)? 3. For about how many years of geological time have humans existed on Earth? 4. For about how many years of geological time have the dinosaurs existed on Earth?

1. For how long has there been life on Earth? 2. For what percentage of time has life existed on Earth (round to the nearest whole number)? 3. For about how many years of geological time have humans existed on Earth? 4. For about how many years of geological time have the dinosaurs existed on Earth?

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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1. For how long has there been life on Earth? 2. For what percentage of time has life existed on Earth (round to the nearest whole number)? 3. For about how many years of geological time have humans existed on Earth? 4. For about how many years of geological time have the dinosaurs existed on Earth? 5. Did dinosaurs exist at the same time as humans? 6. How do scientists determine when an era begins and when it ends? 7. What is the purpose of making a geological timeline?
Transcribed Image Text:1. For how long has there been life on Earth? 2. For what percentage of time has life existed on Earth (round to the nearest whole number)? 3. For about how many years of geological time have humans existed on Earth? 4. For about how many years of geological time have the dinosaurs existed on Earth? 5. Did dinosaurs exist at the same time as humans? 6. How do scientists determine when an era begins and when it ends? 7. What is the purpose of making a geological timeline?
Geologic time scale, 650 million years ago to the present era period events Quaternary evolution of humans 2.6 Neogene mammals diversify 50 Paleogene extinction of dinosaurs 100 first primates Cretaceous first flowering plants 150 first birds Jurassic dinosaurs diversify 200 first mammals Triassic first dinosaurs 250 major extinctions Permian reptiles diversify 300 first reptiles Pennsylvanian scale trees seed ferns Mississippian 350 first amphibians Devonian jawed fishes diversify 400- Silurian first vascular land plants 450 sudden diversification Ordovician of metazoan families 500 first fishes Cambrian first chordates 550 first skeletal elements first soft-bodied metazoans first animal traces 600 650 L O2010 Encyc lopada Britannica, Inc. milions of years ago Late Proterozoic DIozoejed Mesozoic -uoque snojoj
Transcribed Image Text:Geologic time scale, 650 million years ago to the present era period events Quaternary evolution of humans 2.6 Neogene mammals diversify 50 Paleogene extinction of dinosaurs 100 first primates Cretaceous first flowering plants 150 first birds Jurassic dinosaurs diversify 200 first mammals Triassic first dinosaurs 250 major extinctions Permian reptiles diversify 300 first reptiles Pennsylvanian scale trees seed ferns Mississippian 350 first amphibians Devonian jawed fishes diversify 400- Silurian first vascular land plants 450 sudden diversification Ordovician of metazoan families 500 first fishes Cambrian first chordates 550 first skeletal elements first soft-bodied metazoans first animal traces 600 650 L O2010 Encyc lopada Britannica, Inc. milions of years ago Late Proterozoic DIozoejed Mesozoic -uoque snojoj
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