B. The Geologic Time Scale: A Look in Earth's Life History Directions: Analyze the data presented in the table. Then, answer the accompanying questions.

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B. The Geologic Time Scale: A Look in Earth's Life History
Directions: Analyze the data presented in the table. Then, answer the accompanying
questions.
Era
Period
End Date
Life Forms
(millions of
years ago)
Humans appear then become the
dominant life form, large carnivores and
mammoths live but become extinct later
Cenozoic
Quaternary
0.01
Many grazing animals
Large running mammals
Many modern types of modern
mammals and birds
Tertiary
2.5
Flowering plants and trees resemble
modern kinds
Earliest placental mammals
Earliest flowering plants
Dinosaurs die out together with many
marine animals
Mesozoic
Cretaceous
65
Earliest birds and mammals
Jurassic
135
“Age of Reptiles"
Earliest dinosaurs
Triassic
195
Abundant cycads and conifers
Oun
Extinction of trilobites and many marine
animals
Paleozoic
Permian
245
Little change in terrestrial animals
Earliest reptiles
Abundant coal-forming forests
Abundant sharks and amphibians
Carboniferous
285
Earliest amphibians
Extinction of armored fishes
Devonian
345
Abundant fishes
Earliest land plants and animals
"Age of Fishes" begins
First air-breathing animals
Silurian
400
Earliest fishes
Invertebrates are the dominant animals
Ordovician
430
Abundant coelenterates and mollusks
Echinoderms increase in numbers
Trilobites dominant
Earliest abundant record of marine life
Cambrian
500
First life forms in the sea
First bacteria (prokaryotes) appear
Very rare fossils
Precambrian
580
A LE
Transcribed Image Text:B. The Geologic Time Scale: A Look in Earth's Life History Directions: Analyze the data presented in the table. Then, answer the accompanying questions. Era Period End Date Life Forms (millions of years ago) Humans appear then become the dominant life form, large carnivores and mammoths live but become extinct later Cenozoic Quaternary 0.01 Many grazing animals Large running mammals Many modern types of modern mammals and birds Tertiary 2.5 Flowering plants and trees resemble modern kinds Earliest placental mammals Earliest flowering plants Dinosaurs die out together with many marine animals Mesozoic Cretaceous 65 Earliest birds and mammals Jurassic 135 “Age of Reptiles" Earliest dinosaurs Triassic 195 Abundant cycads and conifers Oun Extinction of trilobites and many marine animals Paleozoic Permian 245 Little change in terrestrial animals Earliest reptiles Abundant coal-forming forests Abundant sharks and amphibians Carboniferous 285 Earliest amphibians Extinction of armored fishes Devonian 345 Abundant fishes Earliest land plants and animals "Age of Fishes" begins First air-breathing animals Silurian 400 Earliest fishes Invertebrates are the dominant animals Ordovician 430 Abundant coelenterates and mollusks Echinoderms increase in numbers Trilobites dominant Earliest abundant record of marine life Cambrian 500 First life forms in the sea First bacteria (prokaryotes) appear Very rare fossils Precambrian 580 A LE
1. According to the table, what are the four large units of the geologic time? Arrange
them based on the timeline below. Write your answers on the line provided.
2. In what era do we live in?
When did it start?
3. Of the three periods of the Mesozoic era, which period lasted the longest?
How long did it last?
4. What is the shortest era in Earth's geologic time?
5. Given the following groups of geologic time, which is properly sequenced in order of
increasing lengths of time? Explain your answer.
Devonian, Ordovician, Carboniferous OR Triassic, Devonian, Cambrian?
EARLIEST
LATEST
Transcribed Image Text:1. According to the table, what are the four large units of the geologic time? Arrange them based on the timeline below. Write your answers on the line provided. 2. In what era do we live in? When did it start? 3. Of the three periods of the Mesozoic era, which period lasted the longest? How long did it last? 4. What is the shortest era in Earth's geologic time? 5. Given the following groups of geologic time, which is properly sequenced in order of increasing lengths of time? Explain your answer. Devonian, Ordovician, Carboniferous OR Triassic, Devonian, Cambrian? EARLIEST LATEST
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